Additionally, if you run a PeerTube instance you can mirror others’ videos. I’m hosting my own instance mostly for watching and mirroring. I mirrored Elena Rossini’s fediverse video when it came out, partly because she was worried if her instance could handle the load. I just checked and the video still has 25 peers.

Mirroring is completely manual right now. It would be nice if I could automatically mirror videos from a couple of my favorite channels.