He can ignore or fire his board at will. He is the move fast/break things guy, whose every foolish whim can become policy that impacts billions of people.
By contrast, Google and Apple are no longer run by their flamboyant founders, who were every bit as prone to folly as Zuck. They were constrained by their shareholders, which meant that the blast-radius of Steve Jobs's worst ideas (like treating his otherwise curable cancer with green juice) were confined to his own person.
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