Critical parts of AWS's Nitro are written in Rust, which powers all of their new high-performance computing—is that a "toy"? What about Dropbox's sync algorithm

Critical parts of AWS's Nitro are written in Rust, which powers all of their new high-performance computing—is that a "toy"? What about Dropbox's sync algorithm? You know, the one that runs on every computer with Dropbox installed that is their core business logic, powering file storage for more than 0.5B users? Firefox's Stylo and other parts? They still have hundreds of millions of users.