I would just like to add some cautionary anec-data: there are widespread cases in certain jurisdictions where rightsholders are known to seed the same torrents themselves, just to turn around and send love letters to leechers that connect to them. A good example is Germany with movies and TV shows.
Now, I don't know if, say, Wolters Kluver would/does the same thing, and what the realistic risk of an individual receiving such a letter is, but I think it makes it worthwhile to go over the actual law in your jurisdiction before diving head first on things like this.
I'm not saying it's wrong to seed these things, I'm just saying it might be a good idea to weigh the risks if you don't have a cool 500€ in cash to part ways with.
I don't think there's any country where a copyright holder can send you a copy of their work and then sue you for receiving it. If they sent you a copy, they gave you permission to have it.
Even if there is implied consent this way, they’re probably not doing this- just finding peers sharing the torrent and receiving from them - then they have evidence of actual sharing.
So would knowingly participate in illegal activity to catch criminals? Unless you are the law yourself you cannot do it )
I had a letter one time when I was with Comcast, so I just spend the $5/mo and use seedboxes these days.