I wasn't disagreeing with you; I idly did the mental math, was surprised at how high it was, then thought through how I'd probably finger-in-the-air that it wou

I wasn't disagreeing with you; I idly did the mental math, was surprised at how high it was, then thought through how I'd probably finger-in-the-air that it would take a couple thousand eng years to build a whole car OS. You're building safety critical software, so you're going to start with a very serious test effort, etc. So finger in the air a good chunk of a billion dollars a year for many years.