How Ferrocene Improves Rust

It seems like a matter of time before there are multiple distributions of Rust with some having additional components / libraries for specialized purposes:

Ferrocene: https://ferrous-systems.com/ferrocene/

GNAT Pro Rust: https://www.adacore.com/gnatpro-rust

I would not be surprised if Microsoft, Intel, or Nvidia produce their own distributions in the future, particularly if there are political / governance issues or concerns about getting their wanted features merged upstream. In some cases, it could be that they just want to add proprietary features.