Yeah these have basically been ineffective for P2P such as torrenting for many years. The media companies can just outsource their Anti-Sharing campaigns to third parties and it is fairly trivial for them to do discovery from non-obvious or even residential IPs. They just have to open a given torrent long enough to see who is in swarm and start sending nastygrams to those ISPs.

The best way to protect yourself is seedbox/VPS in a jurisdiction with no filesharing enforcement, or at a minimum join a reputable private tracker, because then all participants are vetted and there will never be a snitch in swarm.