Google rewrote Android's Bluetooth stack in Rust.

Also mentioned:

  Chromium: Parsers for PNG, JSON, and web fonts have been replaced with memory-safe implementations in Rust

Eh, I don't think it's actually one or the other. Google has taken on rewriting some more problematic components in rust. See for example:

Binder kernel driver: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/lin...

Media codecs: https://www.androidauthority.com/android-16-in-process-softw...

This is also happening at Microsoft:

> Rewriting SymCrypt in Rust to modernize Microsoft’s cryptographic library

https://www.microsoft.com/en-us/research/blog/rewriting-symc...

Yeah, there's also a freetype replacement https://github.com/googlefonts/fontations

I think they're trying to avoid rewriting things for no reason though. The things being rewritten tend to have a history of security problems or other issues that would be cause for a rewrite even if it wasn't in Rust.

That ends up being "rewrite it in Rust" because new code includes changes to existing code. A nice thing about Rust is that you can generally rewrite things piecewise there's no need to switch everything at once.