I've always wished that more games would self-host a wiki. Gamers love wikis with detailed data about the game, and I hate it when I go to play a game which has poor wiki coverage. This can happen with small titles that don't have a big enough player base, titles where the player base didn't "align" on one wiki, or with games where the information is inconsistent across game versions/platforms (Don't Starve is notorious for this). But the biggest issue is competing, hard-to-use, user-unfriendly wikis - and this would be solved if more game studios were willing to self-host a wiki.