This article was all I needed to go install unbound and use that as my upstream server for pihole. Took me 20min and it’s been working for the past few hours. Easy and now all my dns are my own. You don’t even need a pihole, just point your router dns to the unbound server. It works out of the box with no configuration unless you want to configure it. Easy

I guess one must simply remove those who block from DNS responders in Adguard Home.

Uh, so it begins with blocking piracy. What’s next? Which public DNS can still be trusted to not be kept on a leash?

Running one’s own DNS resolver has many advantages: https://en.wikipedia.org/wiki/Unbound_(DNS_server)

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All the more reason to setup Adguard Home/Unbound.