Nothing...
I'm using pihole -t and browsing AliExpress showed no red blocking messages, yet the page doesn't load the images.
Edit: On my Android device on the other hand, it's blocking dorangesource.alicdn.com.
I'll try unblocking that for now.
Edit 2: Nothing, again.
lighthouse.aliexpress.com
best.aliexpress.com
ae01.alicdn.com
assets.alicdn.com
g.alicdn.com
i.alicdn.com
is.alicdn.com
translate.google.com
translate.googleapis.com
www.google.com
www.gstatic.com
Is all AliExpress home page is requesting according to Adam:ONE.
Edit 3:
Something interesting I just realized is that, while the domains are not being blocked, the response is NODATA-IPv4! What does this mean?
Full pihole -t after pihole restartdns:
pi@pihole:~ $ pihole restartdns
[✓] Restarting DNS service
pi@pihole:~ $ pihole -t
[i] Press Ctrl-C to exit
Jan 7 21:15:03 dnsmasq[16970]: using nameserver 1.1.1.1#53
Jan 7 21:15:03 dnsmasq[16970]: using nameserver 84.200.70.40#53
Jan 7 21:15:03 dnsmasq[16970]: using nameserver 84.200.69.80#53
Jan 7 21:15:03 dnsmasq[16970]: using nameserver 208.67.220.220#53
Jan 7 21:15:03 dnsmasq[16970]: using nameserver 208.67.222.222#53
Jan 7 21:15:03 dnsmasq[16970]: using nameserver 8.8.4.4#53
Jan 7 21:15:03 dnsmasq[16970]: using nameserver 8.8.8.8#53
Jan 7 21:15:03 dnsmasq[16970]: read /etc/hosts - 5 addresses
Jan 7 21:15:03 dnsmasq[16970]: read /etc/pihole/local.list - 2 addresses
Jan 7 21:15:03 dnsmasq[16970]: read /etc/pihole/black.list - 6 addresses
Jan 7 21:15:10 dnsmasq[16970]: read /etc/pihole/gravity.list - 935537 addresses
Jan 7 21:15:10 dnsmasq[16970]: query[A] pi.hole from 192.168.1.33
Jan 7 21:15:10 dnsmasq[16970]: /etc/pihole/local.list pi.hole is 192.168.1.32
Jan 7 21:15:10 dnsmasq[16970]: query[A] best.aliexpress.com from 192.168.1.33
Jan 7 21:15:10 dnsmasq[16970]: forwarded best.aliexpress.com to 1.0.0.1
Jan 7 21:15:10 dnsmasq[16970]: forwarded best.aliexpress.com to 1.1.1.1
Jan 7 21:15:10 dnsmasq[16970]: forwarded best.aliexpress.com to 84.200.70.40
Jan 7 21:15:10 dnsmasq[16970]: forwarded best.aliexpress.com to 84.200.69.80
Jan 7 21:15:10 dnsmasq[16970]: forwarded best.aliexpress.com to 208.67.220.220
Jan 7 21:15:10 dnsmasq[16970]: forwarded best.aliexpress.com to 208.67.222.222
Jan 7 21:15:10 dnsmasq[16970]: forwarded best.aliexpress.com to 8.8.4.4
Jan 7 21:15:10 dnsmasq[16970]: forwarded best.aliexpress.com to 8.8.8.8
Jan 7 21:15:10 dnsmasq[16970]: query[A] best.aliexpress.com from 192.168.1.33
Jan 7 21:15:10 dnsmasq[16970]: forwarded best.aliexpress.com to 1.0.0.1
Jan 7 21:15:10 dnsmasq[16970]: forwarded best.aliexpress.com to 1.1.1.1
Jan 7 21:15:10 dnsmasq[16970]: forwarded best.aliexpress.com to 84.200.70.40
Jan 7 21:15:10 dnsmasq[16970]: forwarded best.aliexpress.com to 84.200.69.80
Jan 7 21:15:10 dnsmasq[16970]: forwarded best.aliexpress.com to 208.67.220.220
Jan 7 21:15:10 dnsmasq[16970]: forwarded best.aliexpress.com to 208.67.222.222
Jan 7 21:15:10 dnsmasq[16970]: forwarded best.aliexpress.com to 8.8.4.4
Jan 7 21:15:10 dnsmasq[16970]: forwarded best.aliexpress.com to 8.8.8.8
Jan 7 21:15:10 dnsmasq[16970]: query[A] ae01.alicdn.com from 192.168.1.33
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 1.0.0.1
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 1.1.1.1
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 84.200.70.40
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 84.200.69.80
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 208.67.220.220
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 208.67.222.222
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 8.8.4.4
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 8.8.8.8
Jan 7 21:15:10 dnsmasq[16970]: query[A] ae01.alicdn.com from 192.168.1.33
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 1.0.0.1
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 1.1.1.1
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 84.200.70.40
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 84.200.69.80
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 208.67.220.220
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 208.67.222.222
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 8.8.4.4
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 8.8.8.8
Jan 7 21:15:10 dnsmasq[16970]: query[A] g.alicdn.com from 192.168.1.33
Jan 7 21:15:10 dnsmasq[16970]: forwarded g.alicdn.com to 1.0.0.1
Jan 7 21:15:10 dnsmasq[16970]: forwarded g.alicdn.com to 1.1.1.1
Jan 7 21:15:10 dnsmasq[16970]: forwarded g.alicdn.com to 84.200.70.40
Jan 7 21:15:10 dnsmasq[16970]: forwarded g.alicdn.com to 84.200.69.80
Jan 7 21:15:10 dnsmasq[16970]: forwarded g.alicdn.com to 208.67.220.220
Jan 7 21:15:10 dnsmasq[16970]: forwarded g.alicdn.com to 208.67.222.222
Jan 7 21:15:10 dnsmasq[16970]: forwarded g.alicdn.com to 8.8.4.4
Jan 7 21:15:10 dnsmasq[16970]: forwarded g.alicdn.com to 8.8.8.8
Jan 7 21:15:10 dnsmasq[16970]: query[A] ae01.alicdn.com from 192.168.1.33
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 1.0.0.1
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 1.1.1.1
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 84.200.70.40
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 84.200.69.80
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 208.67.220.220
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 208.67.222.222
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 8.8.4.4
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 8.8.8.8
Jan 7 21:15:10 dnsmasq[16970]: query[A] assets.alicdn.com from 192.168.1.33
Jan 7 21:15:10 dnsmasq[16970]: forwarded assets.alicdn.com to 1.0.0.1
Jan 7 21:15:10 dnsmasq[16970]: forwarded assets.alicdn.com to 1.1.1.1
Jan 7 21:15:10 dnsmasq[16970]: forwarded assets.alicdn.com to 84.200.70.40
Jan 7 21:15:10 dnsmasq[16970]: forwarded assets.alicdn.com to 84.200.69.80
Jan 7 21:15:10 dnsmasq[16970]: forwarded assets.alicdn.com to 208.67.220.220
Jan 7 21:15:10 dnsmasq[16970]: forwarded assets.alicdn.com to 208.67.222.222
Jan 7 21:15:10 dnsmasq[16970]: forwarded assets.alicdn.com to 8.8.4.4
Jan 7 21:15:10 dnsmasq[16970]: forwarded assets.alicdn.com to 8.8.8.8
Jan 7 21:15:10 dnsmasq[16970]: reply best.aliexpress.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply global.aliexpress.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply global.aliexpress.com.gds.alibabadns.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply eu1111.alicdn.com.edgekey.net is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply e11956.x.akamaiedge.net is 23.60.208.199
Jan 7 21:15:10 dnsmasq[16970]: query[A] ae01.alicdn.com from 192.168.1.33
Jan 7 21:15:10 dnsmasq[16970]: forwarded ae01.alicdn.com to 1.0.0.1
Jan 7 21:15:10 dnsmasq[16970]: query[A] cdp.aliexpress.com from 192.168.1.33
Jan 7 21:15:10 dnsmasq[16970]: forwarded cdp.aliexpress.com to 1.0.0.1
Jan 7 21:15:10 dnsmasq[16970]: query[A] message.aliexpress.com from 192.168.1.33
Jan 7 21:15:10 dnsmasq[16970]: forwarded message.aliexpress.com to 1.0.0.1
Jan 7 21:15:10 dnsmasq[16970]: query[A] lighthouse.aliexpress.com from 192.168.1.33
Jan 7 21:15:10 dnsmasq[16970]: forwarded lighthouse.aliexpress.com to 1.0.0.1
Jan 7 21:15:10 dnsmasq[16970]: reply ae01.alicdn.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply global-image.aliexpress.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply global-image.aliexpress.com.gds.alibabadns.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply ae01.alicdn.com.danuoyi.alicdn.com is NODATA-IPv4
Jan 7 21:15:10 dnsmasq[16970]: query[A] ae01.alicdn.com from 192.168.1.33
Jan 7 21:15:10 dnsmasq[16970]: cached ae01.alicdn.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: cached global-image.aliexpress.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: cached global-image.aliexpress.com.gds.alibabadns.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: cached ae01.alicdn.com.danuoyi.alicdn.com is NODATA-IPv4
Jan 7 21:15:10 dnsmasq[16970]: reply ae01.alicdn.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply global-image.aliexpress.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply global-image.aliexpress.com.gds.alibabadns.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply ae01.alicdn.com.danuoyi.alicdn.com is NODATA-IPv4
Jan 7 21:15:10 dnsmasq[16970]: reply g.alicdn.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply g.alicdn.com.danuoyi.alicdn.com is NODATA-IPv4
Jan 7 21:15:10 dnsmasq[16970]: reply ae01.alicdn.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply global-image.aliexpress.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply global-image.aliexpress.com.gds.alibabadns.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply ae01.alicdn.com.danuoyi.alicdn.com is NODATA-IPv4
Jan 7 21:15:10 dnsmasq[16970]: reply assets.alicdn.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply wildcard.alicdn.com.edgekey.net is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply e11956.x.akamaiedge.net is 23.60.208.199
Jan 7 21:15:10 dnsmasq[16970]: reply lighthouse.aliexpress.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply nocn-ru-akamai.aliexpress.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply nocn-ru-akamai.aliexpress.com.gds.alibabadns.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply sa1111.alicdn.com.edgekey.net is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply e11957.x.akamaiedge.net is 23.60.213.125
Jan 7 21:15:10 dnsmasq[16970]: query[A] ae01.alicdn.com from 192.168.1.33
Jan 7 21:15:10 dnsmasq[16970]: cached ae01.alicdn.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: cached global-image.aliexpress.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: cached global-image.aliexpress.com.gds.alibabadns.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: cached ae01.alicdn.com.danuoyi.alicdn.com is NODATA-IPv4
Jan 7 21:15:10 dnsmasq[16970]: reply ae01.alicdn.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply global-image.aliexpress.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply global-image.aliexpress.com.gds.alibabadns.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply ae01.alicdn.com.danuoyi.alicdn.com is NODATA-IPv4
Jan 7 21:15:10 dnsmasq[16970]: reply message.aliexpress.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply areaall-ru-akamai.aliexpress.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply areaall-ru-akamai.aliexpress.com.gds.alibabadns.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply sa1111.alicdn.com.edgekey.net is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: reply e11957.x.akamaiedge.net is 23.60.213.125
Jan 7 21:15:10 dnsmasq[16970]: query[A] ae01.alicdn.com from 192.168.1.33
Jan 7 21:15:10 dnsmasq[16970]: cached ae01.alicdn.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: cached global-image.aliexpress.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: cached global-image.aliexpress.com.gds.alibabadns.com is <CNAME>
Jan 7 21:15:10 dnsmasq[16970]: cached ae01.alicdn.com.danuoyi.alicdn.com is NODATA-IPv4
Jan 7 21:15:11 dnsmasq[16970]: query[A] c.tmstrack.com from 192.168.1.33
Jan 7 21:15:11 dnsmasq[16970]: forwarded c.tmstrack.com to 1.0.0.1
Jan 7 21:15:11 dnsmasq[16970]: query[A] s.click.aliexpress.com from 192.168.1.33
Jan 7 21:15:11 dnsmasq[16970]: forwarded s.click.aliexpress.com to 1.0.0.1
Jan 7 21:15:11 dnsmasq[16970]: reply c.tmstrack.com is NXDOMAIN
Jan 7 21:15:11 dnsmasq[16970]: reply s.click.aliexpress.com is <CNAME>
Jan 7 21:15:11 dnsmasq[16970]: reply uswildcard.alicdn.com.edgekey.net is <CNAME>
Jan 7 21:15:11 dnsmasq[16970]: reply e1429.x.akamaiedge.net is 23.15.133.119
Jan 7 21:15:11 dnsmasq[16970]: reply cdp.aliexpress.com is <CNAME>
Jan 7 21:15:11 dnsmasq[16970]: reply areaall-ru-akamai.aliexpress.com is <CNAME>
Jan 7 21:15:11 dnsmasq[16970]: reply areaall-ru-akamai.aliexpress.com.gds.alibabadns.com is <CNAME>
Jan 7 21:15:11 dnsmasq[16970]: reply sa1111.alicdn.com.edgekey.net is <CNAME>
Jan 7 21:15:11 dnsmasq[16970]: reply e11957.x.akamaiedge.net is 23.60.213.125
Jan 7 21:15:11 dnsmasq[16970]: query[A] stun.services.mozilla.com from 192.168.1.33
Jan 7 21:15:11 dnsmasq[16970]: forwarded stun.services.mozilla.com to 1.0.0.1
Jan 7 21:15:11 dnsmasq[16970]: query[A] g.alicdn.com from 192.168.1.33
Jan 7 21:15:11 dnsmasq[16970]: cached g.alicdn.com is <CNAME>
Jan 7 21:15:11 dnsmasq[16970]: cached g.alicdn.com.danuoyi.alicdn.com is NODATA-IPv4
Jan 7 21:15:11 dnsmasq[16970]: reply stun.services.mozilla.com is <CNAME>
Jan 7 21:15:11 dnsmasq[16970]: reply stun1.webrtc.us-east-1.prod.mozaws.net is 54.172.47.69
Jan 7 21:15:11 dnsmasq[16970]: query[A] ae01.alicdn.com from 192.168.1.33
Jan 7 21:15:11 dnsmasq[16970]: cached ae01.alicdn.com is <CNAME>
Jan 7 21:15:11 dnsmasq[16970]: cached global-image.aliexpress.com is <CNAME>
Jan 7 21:15:11 dnsmasq[16970]: cached global-image.aliexpress.com.gds.alibabadns.com is <CNAME>
Jan 7 21:15:11 dnsmasq[16970]: cached ae01.alicdn.com.danuoyi.alicdn.com is NODATA-IPv4
Jan 7 21:15:11 dnsmasq[16970]: query[A] ae01.alicdn.com from 192.168.1.33
Jan 7 21:15:11 dnsmasq[16970]: cached ae01.alicdn.com is <CNAME>
Jan 7 21:15:11 dnsmasq[16970]: cached global-image.aliexpress.com is <CNAME>
Jan 7 21:15:11 dnsmasq[16970]: cached global-image.aliexpress.com.gds.alibabadns.com is <CNAME>
Jan 7 21:15:11 dnsmasq[16970]: cached ae01.alicdn.com.danuoyi.alicdn.com is NODATA-IPv4
Jan 7 21:15:13 dnsmasq[16970]: query[A] ae01.alicdn.com from 192.168.1.33
Jan 7 21:15:13 dnsmasq[16970]: cached ae01.alicdn.com is <CNAME>
Jan 7 21:15:13 dnsmasq[16970]: cached global-image.aliexpress.com is <CNAME>
Jan 7 21:15:13 dnsmasq[16970]: cached global-image.aliexpress.com.gds.alibabadns.com is <CNAME>
Jan 7 21:15:13 dnsmasq[16970]: cached ae01.alicdn.com.danuoyi.alicdn.com is NODATA-IPv4
My guess is that some of the DNS resolvers is giving me garbage responses.
Edit 4:
My guess was correct! I dissabled Cloudflare's secondary upstream DNS (1.0.0.1) and everything works again! Yahoooo!
Edit 5: Cloudflare primary upstream DNS (1.1.1.1) is also being problematic, had to disable it as well!
TL;DR: Don't use Cloudflare DNS if you want to shop cheap chinese stuff lol.