I wonder about the motivation to switch teams. What has Google done wrong? Was he tired? He could retire, open his own lab, raise capital. So many opportunities, why go to OpenAI? Folks talking about the amount of money paid, wasnt he the guy that was acqhired for billions? would OAI pay billions (basically to google) to get him?
At this point it might be about talent.
He could raise and build his own company. But the ability to attract the level of talent that Google/Anthropic/OpenAI have is a different story.