I don't really understand how you're going to get the authorities involved when you have absolutely no photographic evidence for his acts, and the only evidence shown here is the fact that he's making money and giving games to people for free. Not to mention, the police can't exactly take evidence from a person who's identity is completely unknown. That's why these kind of situations are tricky, because you can completely hide your actual life under a shroud called the internet.
I'm not saying I don't believe you, I'm just saying that there's not much you can do about it other than use common sense.
Of course, if somebody offered me free stuff, I'd immediately accept it, except for the part of my mind that makes me think that I'd "owe" them or something. Beachbum would know that :s
Oh well. I guess we all just need to be more careful. The internet can get pretty real :/