Board Thread:Support Requests - Getting Technical/@comment-9336282-20160701030101/@comment-1757994-20160703220359

Wikia considers the "look and feel" of the global nav, and lots of other things, to be part of their branding, so they consider it a violation to change it.

If another wiki got away with it, it probably just means Wikia didn't know about it.

Wikia may issue a warning first, but (from experience) they're also just as likely to revert the change themselves.