If you are worried about legal action, you can buy a seedbox anonymously in some 3rd world country to host your stuff. People use those a lot for private trackers in the bittorrent world, so I figure same applies to webtorrent.

Of course, you can just go without p2p and just do client-server. That's a bit slower though, but you could do that over tor or something.

In the long run, maybe you could figure out webtorrent over i2p, I've heard p2p has had some success over i2p with applications like i2psnark but IDK as i've never used it and IDK how it would interact with WebRTC data streams (might need some sort of proxy?)

peertube replaced webtorrent with hls-p2p. you can't use a seedbox to help a peertube instance anymore.