PeerTube content still has a long way to go, and the network effect on YouTube is unhealthily strong, but as YouTube keeps tightening its grip there are ever-increasing numbers of publishers and viewers looking for alternatives.
If you're a viewer, you can follow, watch and interact with PeerTube accounts entirely from within Mastodon etc. You don't need to be on PeerTube yourself, your Mastodon etc account is enough.
I'll post tomorrow about options for publishing videos on PeerTube.