Leave it open and ban anyone who replies to a post with a single bit of tangentially related clip art. Also perma-ban anyone who defends the act of spamming there with the claim that the jackasses responsible have some kind of "spam quota" they have to meet and that doing it there is acceptable just because the game is inactive. Get rid of that mindset and throw in a couple more ban sprees and I bet the spam will clear up.
Should definitely lock the AoT clan discussion, though.