Satya Nadella at the LlamaCon event in April 2025: "I’d say maybe 20%, 30% of the code that is inside of our repos today and some of our projects are probably all written by software."

In particular Github, with it's copilot-next initiative, has probably so much AI generated code inside today that fixing all this new performance problems will need lots of human developer brains.

It literally have problems the moment MS bought it, way before AI gold rush.