In the beginning, pop culture wiki TV Tropes licensed its content with the Creative Commons Attribution-Share Alike license for free content.
I suppose the morale of the story is, if you contributed to TV Tropes before summer 2012, you should know they're distributing your content under a license that you didn't give them permission to use.
I knew TV Tropes, but I had never heard about those forks, until now. If TV Tropes had not changed the license, I probably would not have heard about the forks at all. Also, while the banning of NSFW stuff would not have bothered me much (although NFSW stuff by itself wouldn't have either), that license change which happens to be both illegal and immoral certainly means I'll avoid using tvtropes in the future. I'm sure I'm not the only one feeling like this.
I'm a bit surprised to hear about them censoring "mature content" since I was just reading the HHHHHHHHHHHHHHHHHHHHHHHHHHHHHH page [tvtropes.org] last week.
Which also raises the question whether such a thing can be called "mature"...it sounds unspeakably gruesome but juvenile vs. "mature"...