You’re basically advocating for a local tl which isn’t a solution. Relays shouldn’t be opinionated or interest based.
Discussion
That may not have been the intention but I think some of the paid relays may already be like this (that's hearsay though, obv I haven't been on any of them).
I think they’re literally all bitcoin focused, esp since you can’t join any of them without bitcoin.
i fixed it by sending myself a few bucks 10 or so and joined 5 or 6 paid relays, i think i even had money left over afterwards.
But the fact that they aren’t means you can’t leverage them to bring in new people, it’s actually pretty random which ones you end up on, and confusing which ones you actually need to be on. It’s a good system for making the individual account sovereign, but a very bad system for attracting anyone interesting.
Hashtags, groups, and shared relay lists would solve that problem. Making a topic centralised on a relay is just dumb because it can be targeted.