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

>>7,8
These are not absolute requirements, its technically possible you could have a free, open-source game with p2p-type hosting, procedurally generated music/voice/models/levels/etc. But history doesn't show any such games existing.