Even for areas where there is a community wiki (e.g. uesp, combineoverwiki), Google seems to prefer the Wikia/Fandom version with all the crap on the pages.
And a lot of those community wikis that originally set up not on Wikia intentionally, like minecraft, terraria and wowpedia wikis, ended up on Gamepedia which Wikia took over and reeled them back in.