I think the big difference now is how these sites stay alive. Now that we know things like Nebula or Kagi can work using a paid model, more of these types of user-supported communities will pop up. What's interesting about this, I think, is that in order for places like these to collect enough users to support themselves, the creator class of the community will have to become famous on one of the free-to-publish communities, like Twitter or YouTube, and then encourage their fans to come with them to the paid community. I imagine at some point YouTube and Tiktok et al will start restricting these types of promotional material to retain users, which is not fun to think about.