Board Thread:Support Requests - Getting Technical/@comment-30561181-20170122104346/@comment-1757994-20170122152002

It depends on the wiki. If the wiki doesn't have a forum like this one, Wikia isn't installing any more of them, because they want wikis to use Discussions, instead. Wikia's argument is that Discussions are more mobile-friendly, and they'd rather only support one kind of "forum," so all forums like this one will eventually be converted to Discussions. (This is not an endorsement, only an explanation.)

Some wikis use DPLForums, which are basically just wiki pages in the Forum: namespace, plus a few parser functions to make index pages, etc. I don't know if Wikia has taken any policy position on DPLForums. I suspect it would take a serious amount of arm-twisting to get it installed on a new wiki.