I say report 'em. I don't like pirates, but I won't go out of my way to hassle them. (Laugh at 'em when they get infected with malware from downloading sketchy warez via torrents, yes
)
But when someone's dirty enough to directly profit off of it... "I'm thinkin' somebody needs to put you down, dog. What do you think?" (I hate quoting Alliance, but it applies in this case...)