I can definitely believe Zapk did this. I've heard of him doing this kind of crap before, and I've heard from others, including respected modders like Zeblote, that some of Zapk's mods have exploits that can be used to crash servers (such as his Server Music mod, though i've personally never had any problems with it). Zapk attempted to troll me once with his bogus "Blockland 2" website and fake gameplay pictures as well (protip if Zapk tells you that Blockland 2 is a thing DO NOT believe him, it's a "prank for the lulz").