However, in late 2012 Wikia added to its License terms of service a retroactive clause for all its non-commercial content, granting Wikia an exclusive right to use this content in commercial contexts, effectively making all CC-BY-NC content dual-licensed. And today, Wikia is publicizing a partnership with Sony to display Wikia content on Smart TVs, a clear commercial use.
A similar event happened at TV Tropes when the site owners single-handedly changed the site's copyright notice from ShareAlike to the incompatible NonCommercial, without notifying nor requesting consent from its contributors. Is this the ultimate fate of all wikis? Do Creative Commons licenses hold any weight for community websites?"