This is something the distributed video people don't seem to entirely understand. Look at how many copyright disputes happen on YouTube - not actual piracy, just disputes. Now imagine every dispute was resolved by sending DMCA takedown notices or subpoenas to individual users who happened to have the misfortune of watching a particular PeerTube video someone didn't like.
Centralized and non-distributed video platforms have one critical advantage over distributed: it's harder to sue users. That's because you'd have to first sue the host to get logs, which requires at least some legal adjudication of the merits of any underlying copyright claim. Distributed systems shift that legal liability directly to viewers. So you need some sort of mechanism to ensure people who provide you the video don't have an IP address to trace, which immediately puts you in all sorts of hard UX problems that the wave of encrypted P2P software from a decade and a half ago never really figured out.