for 3d printed gun people (not personally one of them, just browsed their subreddit once), they use some vaguely blockchain crypto related p2p video host called LBRY, not sure if that model is scalable though, as it seems to be based around free p2p hosting like torrents, although there was some mention of hosting fees, presumably in crypto? not sure

the infrastructure of the pirate streaming sites is impressive, but I bet that is still orders of magnitude easier than hosting youtube.