If I were to be a content creator, I would host my own peertube to serve it and make sure it's available. I would also share it with people I know and trust, and generally use it for my personal use so it caches what I watch and whatnot.

But hosting videos for other people? Yeah no, apart from being hugely expensive, it's also a legal nightmare because someone will start posting shows and movies on it and I just don't feel like taking the legal burden of some random anonymous users.

Same reason my Lemmy is invite only, I can be somewhat confident my users will behave because I know them all (and also legally, I can just send the cops their way if they do bring legal trouble).