I read many comments on how PeerTube isn’t sustainable as a YouTube alternative and, while it’s certainly true right now, are we sure it will be the same in the near future?
The platform is growing and the new mobile app is making great progress; I can certainly see some people investing in a major instance some day, accelerating the platform adoption.
As far as I know the p2p only potentially applies when >1 global users are watching a video simultaneously.
edit: am I wrong? I thought they had bittorrent-like swarming.
You are right, but the users also need to be watching the video at the same resolution. A PeerTube instance can also function as a peer.