Meh, what's done is done. We're better off dealing with the situation than speculating about the how/why of Proboards sudden interest in upholding their TOS.
As has been mentioned, there are a few options being tossed around and the moderating team is still discussing stuff. We don't have anything super concrete yet, so really nothing to post about, but that will probably be changing.
Could it be some troll that's been banned it the past? YoloSwagShooter or whatever his name is?
I know who yoloswag is, that person doesn't care enough to bother with the forum anymore.
It could be someone who got banned, it could be someone who isn't even registered on the forum and just wanted to be a dick. It's impossible to say. I do find it funny if it's someone from the community, as MIA isn't the only Michigan based airsoft forum hosted on proboards. Why take the time to strike out at the forums that help organize events for the entire state?