The problem, I think, is that PeerTube (and Owncast) don’t effectively do the parts that content creators™ find valuable - wide distribution/discoverability and linking content to ads for a profit incentive.

If you want to make content or stream as a hobby, these things can make sense. If you already have a large following then you might be able to convince that following to join you on one of these alternatives. Anything in between… I’m not sure it’s very compelling for most.