Long story short - a mentally ill, autistic, schizophrenic Florida kid found out about bZ7 and made more enemies than Hitler within the first few weeks by constantly crying and reporting everyone. (I heard that the sales of Kleenex in the Florida area sky rocketed because of the amount of tears that were shed every day). The result of this was everyone left bZ7 and the server was always empty which led the admins to cancel/close/erase/delete it.
Edit* This is actually pretty true though lol. I played bZ7 forever and the server was always full at any given time. Literally after this hero joined and started being himself the server population slowly depleted, until you'd have to wait until the evenings to even have enough people to get a round going.