It looks like fans like Rust, but not many people actually want to use it, so they rewrite random stuff, so maybe others will notice it somehow and start using it.
> Figma Our real-time multiplayer syncing server (used to edit all Figma documents) is written in Rust.
> npm, Inc - Replacing C and rewriting performance-critical bottlenecks in the registry service architecture.
> OVH - We used Rust to build a high performance, highly available log management system.
> QCERT (Qatar's National CERT) - DNS log analysis pipeline entirely written in rust, running on top of our own Rust stream processing platform.
> 1Password - We use Rust to power the entire backend (encryption, networking, database, and business logic) of all our client apps.
> Fire and Emergency NZ - The New Zealand Fire Service is using a custom geolocation search engine, built in rust, that runs on embedded hardware within a fire truck to stream hazard information to a fire crew at an incident.
> Deliveroo - We are using Rust to quickly make assignment decisions in our food delivery network.
> System76 - As a Linux-based computer-manufacture, much of our infrastructure and desktop Linux projects are written in Rust. From hardware certification, flashing, and imaging; to system services and GTK3 desktop applications.
> Canonical - Everything from server monitoring to middleware!
> Cloudflare - We are using Rust as a replacement for memory-unsafe languages (particularly C) and are using it in our core edge logic.
https://www.rust-lang.org/production/users
(that "the top of one person's head" is what defines existant vs non-existant, many wouldn't agree).
I’m quite wary of jq for the reason that usually I don’t need it often enough to learn its language. That would be another piece of software like this.