Which are all illegal, thus (in my mind) it is implicit. In fact, bans on the things you've listed have probably been in their Terms of Use since they turned th

Which are all illegal, thus (in my mind) it is implicit. In fact, bans on the things you've listed have probably been in their Terms of Use since they turned their server on. I mean, those aren't allowed anywhere, they're almost completely out of the realm of this discussion which is explicitly about banning things simply because someone doesn't like them.