The title litterally means "Rust, not Firefox, is Mozilla's greatest industry contribution", like noone is talking about society contribution.
I don't understand what are you talking about.
Yes, they're programs from the benchmarks game that use a lot of UnsafeMutablePointer, which is:
> provides no automated memory management or alignment guarantees. You are responsible for handling the life cycle of any memory you work with through unsafe pointers to avoid leaks or undefined behavior. [1]
The main reason is many companies have a lot of C/C++ devs or other devs learned Rust, so they don't have to hire new Rust programmer. There are many places using Rust, you should check this out: https://www.rust-lang.org/production/users
You might want to read this iconic tweet[3]
[1]: https://wasmtime.dev [2]: https://wasmer.io [3]: https://twitter.com/solomonstre/status/1111004913222324225