It's mostly used in various education projects, and various commercial and research projects that are largely done by a single strong programmer (e.g., Carmack-ish people).

There's at least one large-codebase complex Web-based production system in it, which incidentally accomplished a first on AWS, but you've never heard of it, since it's internal-ish. It was a happy accident of history, that grew out of a lone super-productive programmer starting a complex data science infrastructure that I'd say few teams could've pulled off in a non-Lisp.

I've been waiting for another startup to decide they're going to do their first version in Racket, to do something non-cookiecutter. (It turned out neither myself nor my own startup co-founder had any interest in doing the CEO side of things, or I would've launched such a startup already.) But anything Scheme-related has a terrible curse for perception: students associate it with academic oddities in first-year classes, and then they focus on whatever "real" tools they hear employers or other companies are using.