Haskell spotted in the wild

Age of Empires 2 clone(OpenAge) has a game server written in Haskell(i assume for the thread safety or something)
https://github.com/SFTtech/openage-masterserver

Or have people offer their cpu time.

That means giving control over the game data, allowing cheating and arbitrary banning of player. Game servers may host different versions or mods dictated by whims of hoster.