> C compiler written by AI is used somewhere to compile production code?

That's the point - it isn't used; the quality is too poor to even replace tcc.

> They'd revolt en-masse if their…

who is revolting? still waiting for an example of this ficticious, unfortunately often-cited fantasy… if the example is C compiler no one uses (no one even spent serious time trying to make it work either) the bar is waaaay to low for your line of thinking IMHO