I could argue that this is where we are now. People "know" (unconsciously, via their browser and OS settings) certain DNS resolvers that are considered global / canonical. There's nothing stopping someone from choosing some wacky resolver that points domains to wacky IP addresses.

Nothing stopping them, that is, except for the lack of user-facing settings and apps with good UX. Imagine you had a web browser that had a little drop-down next to the URL bar that let you choose between "default global DNS" and "my region's DNS" and "my social circle's DNS" and "my secret club's DNS". When you enter a domain you would (maybe) get different results depending on your DNS context... This is maybe a silly contrived example, but it would work today with just an added select box.

You could imagine integrating something like this with Nostr lists or groups or something. It's just a lack of creative experiments preventing this