Actually, I was talking about governments, but good point also. Spammers themselves only do it because !@#$%^&*er advertising companies buy spam lists from them and pay good money for it. You have to assume that someone cares sufficiently to stop something, as well as having the access power to the means of stopping it, in addition to having locally hashing it having a permanent global effect of restraint. If, say, you pissed someone at Level3 Communications, and he wants you off the grid, and he's like top exec member of the board, then he most certainly can shut you down. Or at the very least, cripple your Internet so badly it'll look like you're having severe technical glitches. Worse yet, go completely covert on your !@#$%^&* and start filtering your traffic personally and taking you out of the net-neutrality frame. They can do that, if they have a reason to.