> Yet it's currently hard to find a real usecase for it, since neither the content you want nor audience is there on PeerTube at the moment.

The same use case as Youtube in its early years.

You upload a video, and send your friends a link (or post/embed on your blog).

That's good enough. It's totally OK if search is not useful.

Of course, the elephant in the room is the cost to run one of these servers...