I am not trying to advance wild hypotheticals, but something about his behavior does not quite feel right to me. Someone who has enough money for multiple lifetimes, working like he's possessed, to launch a product minimally different than those at dozens of other companies, and leaving his wife with all the childcare, then leaving after 14 months and insisting he was not burnt out but without a clear next step, not even, "I want to enjoy raising my child".

His experience at OpenAI feels overly positive and saccharine, with a few shockingly naive comments that others have noted. I think there is obvious incentive. One reason for this is, he may be in burnout, but does not want to admit it. Another is, he is looking to the future: to keep options open for funding and connections if (when) he chooses to found again. He might be lonely and just want others in his life. Or to feel like he's working on something that "matters" in some way that his other company didn't.

I don't know at all what he's actually thinking. But the idea that he is resistant to incentives just because he has had a successful exit seems untrue. I know people who are as rich as he is, and they are not much different than me.