

It’s generally seen as okay on a similar level to undercover work. They do it for Investigation reasons, the torrent was already uploaded before they joined, their monitoring serves a legitimate law enforcement purpose, and they’re authorized by the copyright holder (themselves) to do it. They didn’t put the movie or whatever out there themselves.
It’s one piece. You tell me I want to spot cars one thing they have is wheels, I’m not going to immediately assume every bike I see is a car. But taken with other signs it builds a pattern.
Honestly I’ve found the best way to spot LLM is just use it an absolute crap ton. You’ll start to be able to spot it the way you can recognise the style of an author or director.