How is a language technician in Rust even born? I imagine C, Java, Python technicians come from school or other educational materials, but there’s no significant number of people with Rust as a first language, right? Were they just Rust fanatics unwilling to consider other languages?

I'm not even sure "fanatic" was the right word, as most of them actually had a pretty measured take on the state of Rust and were not the sort of aggressive evangelists that people sometimes associate with the language. They were just way more interested in exploring/iterating on/consuming the programming language itself, rather than using it to actually solve business problems. I suppose depending on the connotation of the word "technician" we might be discussing separate people, although it's almost a horseshoe effect where they both loop around into not moving a project forward.