Yes, I used to write web applications in Haskell. I did that before Rust was viable for writing web applications (and way before Rust reached 1.0). The community has IMO become a bit smaller after Rust became so popular.

I still miss HKT and the productivity benefits from those (the classic mostly true joke is that there are multiple npm packages whose entire functionality can be replaced by a single function in the standard library, `traverse`), but Rust's traits system is good enough.