A very popular and active wiki, Sexypedia, has been closed.
It wasn't meant to be related to NSFW or fetishes at all, but it had a seemingly inappropriate name, though. The name of this wiki is supposed to represent "Tumblr Sexyman".
This is what had me wondering: Are wikis with inappropriate names forbidden?
Wikis cannot be private, and this is one of the reasons why NSFW is forbidden (since everyone, including minors, can see wikis).