There are over 50,000 and over 40,000 repositories just on GitHub that contain Go and Rust code, respectively. [1] Among them, some truly massive projects like Kubernetes for Go or Servo for Rust. I will freely admit your argument for new and/or obscure languages like Hare, but Go and Rust are not "rare" under any reasonable definition of the word.

[1] https://github.com/topics/go https://github.com/topics/rust