That function exists in hundreds, if not thousands, of GitHub repositories. The function is so well known it has it's own Wikipedia page. If there is a more famous function in computer science, I don't know what it is. The fact that a machine trained on GitHub repositories might reproduce such common code is not alarming or surprising to me. I think people are using this as an example and implying it's happening all over the place, but I've yet to see another example like it.