Bill shock might be waiting for anyone silly enough to deep dive with peertube. And website hosts don’t usually play nice when you want to start streaming media. I can see why a lot of people aren’t jumping in with both feet.
You have to remember that YouTube has a gigantic corporation to back it. A lot of platforms tend to lean heavily on YouTube for content.
I think it’s a case of waiting for another expansion in the Fediverse to make it all worthwhile. Otherwise, the app you develop could suddenly find itself disconnected from any instances willing to stream a large volume of content.
I might be wrong, but that’s what I considered when thinking about contributing.