If you really want an eye for an eye at least do it properly for christs sake.
Eye for an eye... They pirate your models right? Well pirate their web site. You could write a DNS squirrel to sniff out their domain name login and point it to TGC, or you could hack their web site and lock them out of it - pointing the DM downloads to the purchase screen.
If you really want justice a wimpy spam attack isn't going to do anything. It's not original, it's not funny, and it probably wont be effective. Odds are they'll just do it back and then it becomes a battle of hacker v's hacker... Who makes the best scripts...
The result is DBP forums will go down for some period at least.
Eye for an eye is not only far more creative, shows at least some technical ability to do, but would also be an appropriate course of action that is both justified and terminal for the opposition.
Which is the biggest tool? The computer, or the muppet who invented it?