Board Thread:New Features/@comment-4259726-20180408124141/@comment-15278555-20180617161138

There are a number of problems with ported that feature including but not limited too:
 * Wikia's code being quite a bit different requiring some effort to make it work here.
 * I believe it (as do most of the plugins and apps on Wikipedia these days) uses OAuth and Wikia doesn't have that capability...yet.

Having said that, the code really isn't that complicated so even if they created their own it wouldn't be that hard and they could use the source code from WP as a foundation to work from.