I agree it's not common. But neither are Rust applications with 1000+ dependencies. I don't think I've ever compiled a Rust project with over 1,000 dependencies.
Maybe I am just unlucky enough to always running into Rust projects that pull in over 1000 dependencies. :D
In retrospect, I should have kept a list of these projects. I probably have not deleted these directories though, so I probably still could make a list of some of these projects.
Hundreds? Yes, absolutely. That's common.