OCaml is mostly used in speciality applications. I have a few friends that work on flight control software for satellites and their stuff is all OCaml which is apparently not that uncommon in their field.

That said none of them knew OCaml before joining said company and thus none were hired because of it... so that does somewhat invalidate the "right" people argument but I guess if you are doing literal rocket science I think that is pretty self-selecting for smart folk lol.