I'd say significant portion of F# users are using Fable to generate Javascript. F# can compile to Rust and Python as well.
https://github.com/ncave/fable-raytracer
Fable -> JS is our main use case for F#; having had to hire for this, I wouldn't say it's accurate. Most are still focused on the .NET implementation side of things. Compilation to Python is nice, I've yet to figure out why we wouldn't just use Rust rather than F# -> Rust... Rust is a great language and it feels a little silly to abstract over it.