After a little thought, I've decided this was a poor decision. Not going after a spammer... going after the WRONG spammer.
Windows Messaging pop-ups are so easy to stop it's disgusting. Really. Even if you're a total moron. You don't know what causes them, but hey, right in the title bar for the popup it says "Windows Messaging".
So you go to any search engine - even the ones that only morons use, like iwon.com, and you type in "Windows Messaging popup" in the search box, and the second result on the list is instructions for turning off Messaging spam.
Or, if you're a responsible person, rather than an idiot, you're behind a firewall or NAT device or something that blocks the ports used by Windows networking, and you don't even know there's a problem.
I'd say Messaging Spam isn't a high priority.
So what spamming bastard should the FTC hit?
How about the one that makes a pop-up that looks just like a BSOD? I actually get calls about that.
How about the people that make new.net or the ones who install parasite software without notifying the user?