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. If you're interested in open source software or data privacy you might find something here or there, but topics like gaming, music, sports or movies are very much underserved on the platform at the moment, and get almost no attention from viewers.
For example, I recently did a test search and found a let's play for the Legend of Zelda: The Wind Waker. The videos had something like 3-5 views on PeerTube, and about 10-15 times that on the creator's YouTube channel.
It's the same issue as on Mastodon and Lemmy to be honest, except exaggerated. If the majority of topics aren't well represented on these platforms, then the general public won't use them. And if the general public won't use them, then the creators that would bring the general public over won't use them either.
They need to figure out a way to encourage people outside of the 'hardcore tech nerd raised on Usenet' audience to use these platforms.