I'd like to see something like that take off, because I'd be willing to give it a try. I also think the communities should be limited. Maybe have several sizes and see how it plays. Something that never grows beyond 250. Never past 1000. Something along those lines.
Relatedly, I'm just about on board with the idea of a modern day Compuserve or Prodigy. Pay to play, but in return you get no ads, no malware, no algorithms, no AI. A gated community for the Internet.
But most people will still opt to stay on the slop-filled web because it’s free and because they like being angry. And as long as they stay the societal problems that stem from the toxic internet will live on.