I don’t have concern with their privacy policies and I hope to see some benefit of DNS0.eu having private ECS over not having it at all (Mullvad). DNS0 is also nice at family as they are quick to block malicious domains and those can be reported through many methods including webpage (which also allows false positive reporting) and a Telegram bot (although I wish they send some sort of read-receipts). https://www.dns0.eu/privacy
So far I have seen just two false positives, more significantly git.disroot.org.
Mullvad Base I again mostly use on mobile where there isn’t so diverse selection of content blockers available and my only issue with them is not having a server in Finland, while Sweden is close enough.
Update: this thread inspired me to look into the DNS page after a long break and I noticed that it doesn’t make distinguishion between private ECS and normal ECS, which made this an issue time