That sounds like a pretty cool solution. I don’t have a good mental picture for how that would work on the technical side, but anything that does behind-the-scenes work like that for new users is probably worth considering.

I think it’s healthy for the fediverse to have similar communities on different instances, because if we centralize, it basically becomes reddit, which means moderation and censorship are at the whims of whoever owns the only place people go.

I’d also like to give a shout-out to sopuli.xyz/c/memes for having a popular memes community too.