Google used AI assistance in designing their last one or two TPUs.
I am pretty sure Tim also used Siri for the development of the next Siri(you know to set up the alarm clock)
I'm sure they also use the Gemini coding agent to write new Gemini code. But that's far short of self improvement.
I am pretty sure Tim also used Siri for the development of the next Siri(you know to set up the alarm clock)