yup, even youtube isn't profitable. Video remains one of the largest sinks of resources. A 4K movie is stored on a disc of about 66GB, so about 30GB per hour of 4k video. Even with peertube it'd take the best hobbyists to run even a modest server for a few streamers. We're talking people with PB level of storage capacities now with fiber lines to their house to truly host peertube alternatives, and if we're talking cloud we're talking thousands per month.
It's not impossible, I don't want to get people down, but that's the major hurdle