I made the call between Haskell and Rust for my fintech startup. I chose Rust when I realized how few Haskell programmers there were available to hire - at 20 engineers, we'd be one of the largest shops on the West Coast of the US AFAIK.
That said, we were one of the largest Rust shops outside of the FAANGs, but Rust was straightforward to teach to C/C++ folks.