I have heard the theory that game/app devs do this but I find it hard to believe (in a couple instances maybe but not in any meaningful volume). Regardless of their intentions it would be a huge smear on their company to be authoring malware to thwart piracy.
As to groups doing this, I don't think that either, it's just people taking the app/game/etc and bundling it with their malware.
Like I said, I haven't been to these sites in ages but I doubt a whole lot has changed. People who do illegal stuff are very unlikely to complain when illegal stuff victimizes them.