I think, one big reason why people are gladly implementing libraries in Rust is that they’re useful even outside the ecosystem.

In languages which need a runtime environment (Python, Java, JS, Go etc.), you’re locked into that ecosystem. Your code will only run inside of that runtime, meaning someone using another language can’t run your code.

Rust does not need a runtime and it can generate libraries in the format of C. Any mature programming language can call into C libraries.
Plus, Rust’s performance means it’s actually quite worthwhile for higher-level languages to call these libraries.