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

Can Linux community design an original game for once? All open source games are direct clones of commercial products, beside maybe Nethack and MUDs, which are more of a game design research projects, that later gave birth to WoW and proper products.