[Thiez]

They want obfuscation. Rust libraries necessarily include the AST for public generic functions. So it may not be suitable.

[IshKebab]

I think that's a totally different topic, but regardless it's the same with C++ and I don't see that being a big issue to C++ library vendors.

Rust doesn't have a stable ABI so it's not like you could realistically distribute a closed source "native" Rust library anyway.