That is more than I expected, but saying they use Rust a lot is still just speculation.
it looks to me like they are at the point where they have a couple of key projects in Rust that they consider successful and looking to adopt it more widely. That adoption probably hasn't really happened yet, but it looks like the decision to go ahead with it has been made.
AWS seems to be at the very least interested in Rust. Both Firecracker and Bottlerocket are primarily written in Rust. And there is an official Rust runtime for Lambda. It would be nice to get some specifics about internal usage though.
> Since we're building up a team to work on Rust I now get to do more Rust-based phone screens and coding interviews.
It sounds like they are hiring Rust developers quite a bit too.