My thoughts too. Get the money, and do something useful with it. It was an expensive and still pretty meaningless gesture. Now, maybe he didn’t want to spend more time at FB and bought his freedom with that money. Perfectly fine, but please don’t spin it like some morally applaudable act.
He already did. He'd gotten a few billion dollars out of the acquisition by then. He invested $50 million of that into the Signal Foundation, and I would hope he will invest more in the future.