Interesting article, i will have to dig around some more.
I want to say though, that the initiative is sponsored by the EU and has privacy preservation as one of it's main objectives, so until proven, i will assume that this is all circumstantial.
For me at least, it solves exactly the use case i was previously using NextDNS for, which was basically DNS level ad blocking, and while i still have a NextDNS subscription, my previous months of testing have proven DNS4EU to be more stable and slightly faster responding than NextDNS (for my usage).