fwiw, the use of C is infinitely more "coerced" than the use of Rust.
on my Linux system, C takes ownership of a 'top-level' /usr/include directory, all the kernel APIs have their canonical definitions in C headers, a lot of system features like nsswitch require dynamically linked C libraries etc. etc.
Rust is just something that programs can choose to be written in and that doesn't inconvenience me in any way.