Rethink does not require you to use their own DNS. You can choose from several or just use the system DNS.
In addition, it has on-device blocklist where you import rules from various public lists. Just like a desktop ad blocker.
And, of course, I have a VPN configured by downloading a wire guard config file from Mullvad and importing it into Rethink.
I was the first person to post on the pluriverse in 2008.