I don't know what happened with any certainty. But given the sudden departure I am gonna have a guess and say they had something reported.
Despite having a mature content function to hide adult material, they have a specific policy in regards to pornographic content. They don't go looking for it to remove it, but if anybody reports sexual explicit material to the admins, they will remove it instantly and you can't do anything about it. Not sure if that's what happened, but I do know JPNovas stuff WAS explicit.
I figure it's only a matter of time before some of my stuff goes the same way...not sure how I'll react when that happens.