> Many programming languages especially more terse, modern ones (I'm looking at you, Rust) -- the symbols don't mean anything in English either. Does "for" or "fn" or "impl" mean anything to average English speakers? This feels more like a bunch of extra symbols like "==" and "!" rather than the anglosphere enforcing its dominance.

Yes, they do. When I was learning Rust it was obvious that "fn" was function. "impl" is a little trickier, but I read it as "implements" or "implementation of". "dyn" is "dynamic implementation of" or something like that. And "for" is the same in all the other programming languages I know.