>>convex+(OP)
While I don’t know what is happening in OpenAI, from my experience(long enough to have an opinion), top people often leave when the employer is doing well or passing the last hurdle because, by that time the employer has gained adequate presence and brand identity that anyone leaving can immediately end up in top FAANG or equivalent Corps with much better benefits and of course pay/equity and other things.
Only time employees leaving is a bad sign had been when the company had been in zombie mode too long(few years) and haven’t delivered anything yet or still in alpha/beta stage with crappy deliveries no one is using or has no significant uptake.
Also, if there are financial difficulties, then a lot of people leave in droves and some actually come back after finances get better.