It's been used by only a handful of companies that I know of (not counting Naughty Dog). Usually as one-person projects for which the person is allowed to choose fringe tools. A couple of those turned into major projects, but they still needed only a couple/few (super-capable) people.
Maybe the most interesting thing about the user base is the enthusiasts: as a resume keyword, Racket is effectively unemployable, and there's large opportunity cost in the current "tech" job market, of spending time on "technology" that doesn't facilitate job-hopping. So the enthusiasm seems to be for the genuine technical and community merits.
Or just fun. People also play and create free games on the Internet.
You might also find this interesting: https://fsharpforfunandprofit.com/posts/recipe-part2/
Another thing - if you find you write small scripts in Python to read a file or parse some stuff or plot a couple things but these aren't for production, Racket has an amazing library of basically everything you could need. It's actually very practical as a scripting language.