I was alive and online when the pay package was announced (21 March 2018), and I remember how much it was NOT certain any of this would come to fruition.
It's simple, he was shown ~2 Bn worth of shares and told he would get them only if he converted the shares to 56 Bn.
You (the big institutional shareholders AND the small shareholders) were greedy and knew what he would do, you paid for alchemy and he made gold from lead, don't cry now.
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disclaimer: not an american, not a shareholder or user of his products (not even paypal lol, it doesn't work in my country)