Are there any known legal actions taken for people sharing copyrighted material? I know that in some countries e.g. Germany it is dangerous to share via P2P as it's quite probable that some law firm will sue you.
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?)