This is pretty interesting!
I think serving video is a particularly interesting use of Webtorrent. I think it would be good if you could add this as a front end to basically make sites DDOS proof. So you host like a regular site, but with a JS front end that hosts the site P2P the more traffic there is.
There is PeerTube for video content.
I think it is very difficult (and dangerous to the host) to serve user-uploaded videos at scale, particularly from a moderation standpoint. The problem is even worse if everyone is anonymous. There is a reason YouTube has such a monopoly on personal video hosting. Maybe developments in AI moderation will make it more palatable in the future.