User blog comment:Susanolivia/Fixed Width, Sidebar, and the Removal of Monaco/@comment-113335-20101005000033/@comment-1656767-20101005180820

No one can give me an answer, because I don't think most editors really know, and those who do are not talking.

From Wikipedia:

Wikia's growth stems not only from wikis founded on Wikia, but also from incorporating formerly independent wikis that joined Wikia over time, such as LyricWiki, Uncyclopedia and WoWWiki.

Wikia requires all user text content to be published under a free license; most use the Creative Commons Attribution-ShareAlike license, although Memory Alpha and Uncyclopedia use a noncommercial variant and some use the GNU Free Documentation License.

Wikia has merged separately founded wikis, such as Uncyclopedia, to subdomains of wikia.com against contributors' wishes, citing a need to boost its attractiveness to advertisers.

[HERE IS THE HOPEFUL PART]:

The company intended to merge Memory Alpha, WoWWiki, and Zelda Wiki in a similar fashion; the proposal was successfully opposed by users of all three sites.

Since no one will answer, here is what I think happened, like Memory Alpha, WoWWiki, and Zelda Wiki, editors protested loud enough that the staff backed down. That is why Uncyclopedia is exempt.