So, according to this Rob guy (I guess one of the owners) it appears to be an automated takedown of not too much significance. The easiest way to deal with it was just to take down servers, host them somewhere else as if nothing happened.
I would note here, as an aside, since I am typically very interested in IP (intellectual property) issues, that Lone Wolf Development is guilty of similar shenanigans. For instance try to make any sort of "army list generator" for table-top games and they will sue the shit out of you if it has either the words "army" or "builder" in it, despite those being purely descriptive terms. So they're not exactly angels, themselves. They're "subscription" model is also a little evil, but that's a different topic.
Anyway, it would basically be the worst thing ever if GW tried to come out with their own army builder. It will almost certainly suck, and then they really will go after army builder in earnest.