Ads don't get blocked in Chrome - works fine in other browsers

[h4nc]

While reading a bit more about DoH, I found some information about setting up the secondary DNS.
I always thought it would be a backup, but just found out that it is not.

Why should Pi-hole be my only DNS server?

Reduced Ad Blocking Capability The main reason you should Pi-hole as your only DNS server is that you will see increased performance in the blocking of ads. If you have two DNS servers (Pi-hole and something else), your network clients may not always query Pi-hole for name resolution. If a query happens to be answered from a non-Pi-hole DNS server, your block lists will not apply (since that DNS server doesn't know about them). All Queries Need To Go Through Pi-hole First Since other DNS serv…

The thing is I have pihole for my than a year and never had the feeling that is just the secondary DNS, which would mean no blocked ads. I used 8.8.8.8

This basically tells me that is only necessary to disable DoH in chrome when it detects a known DNS server.
So the reason why this might not be an issue for others is that they probably followed the suggestions in the link above and did not use a second DNS. In conclusion chrome should not use DoH.

I already deleted my secondary DNS server. However I’m a little bit concerned about what happens when my pihole instance goes down for some reason. No secondary DNS, no surfing websites. I know about the option to set up another pihole but this would be too high maintenance for me.