It is used in financial tech sometimes. Although this is misleading as financial tech has a penchant for weird functional shit like OCaml, F#, K, Julia, etc...

It is used in financial tech sometimes. Although this is misleading as financial tech has a penchant for weird functional shit like OCaml, F#, K, Julia, etc... Unlike a video game, you aren't transitioning state all the time. Proposition-based testing is also very convenient in Haskell with say QuickCheck, good for dealing with money.