[FYI] Google / Chrome: "Experimenting with same-provider DNS-over-HTTPS upgrade"

It's not speculative. If the current dns has a corresponding DoH server then Chrome will automatically switch to DoH. How does Chrome determine if there's DoH server available? It's has a list of supported DoH servers:

  • Cleanbrowsing
  • Cloudflare
  • DNS.SB
  • Google
  • OpenDNS
  • Quad9

This is straight from the horse mouth. DNS over HTTPS (aka DoH)