Unfortunately I think that bed has been shat, because everyone wants to be a general purpose instance. Nobody wants to be sportslemmy or musiclemmy or movielemmy where they only host communities that match their theme, which is why we have linux@lemmy.world, linux@lemmy.ml, linux@sh.itjust.works, linux@feddit.org…

So “Join an instance for a community you’re interested in”…not sure if that’s tenable on Mastodon but it sure ain’t on Lemmy.