This is splitting hairs a bit, but, those languages only really have one implementation that dictates where things are going as far as the language is concerned. C is special because of when it started and what it was trying to solve in its day. My point was just that the communities and languages are every bit as monolithic as Rust, so why was Rust singled out?

That's not true of those other languages. While the alternative implementations are always playing catch-up as it relates to language changes, the developers of those implementations do participate in the discussion around those changes.

I think we can go with the 90% rule here. I would bet that at least 90% of Python users are using cpython.