The third option could surely be he was fired ? Although I would imagine MongoDB would have organised someone already to take over.

The previous CEO immediately returned as interim CEO, so they sort of did have someone ready.

	▲	bilekas 3 hours ago \| parent [-]
		Interim is always a temp one though, and the fact it was the previous feels to me at least like them saying "Hey we need a favour" but I have no insight.