Theory: possibly because Mira disagreed with Sam on launching so much so quickly (she reports to him), he overrode, it went wrong, and then she took it to the board.

Hence, they trust her to take on the interim role.

Again, all speculative.

I don’t buy it. “Move fast and break things” is the mantra of Silicon Valley. A buggy rollout is classic, and IMHO no big deal.

This would be an enormous overreaction to a buggy but seemingly successful rollout.

If you are referring to the knowledge file leak with GPTs, it didn't seem that devastating and wouldn't have warranted such a dramatic exit.