Peer to peer viewing can only go so far. Some people, when they put a video out, get hundred of thousands of view in the span of a few minutes. This works relatively well on youtube, with a very large CDN (and probably some heuristics for big accounts). It is enough to hinder “smaller” platforms like dailymotion. It would just be a terrible experience on peertube as it is now, unless the creator preemptively mirrored it in many, many places beforehand.