@whitequark Somehow they learned C by themself. They probably also learned some other languages like python, java, js, go, etc.
It's not that they don't warnt to learn. It's that, despite common believe, c being a small language makes it easy to pick up, intuitive even, whereas rust, with it's more complicated syntax, typesystem, and special rules (like borrow checking), make it hard to learn, especially with prior programming knowledge. Much work, low to no benefit, not worth it.