Most uberwealthy aren't doing it for the extra money. And if they are, I think it's fine if they call it quits early. There are plenty more people who could be rich if Bezos/AMZN didn't suck all the air out of the room.
Right, because it's totally normal for an online book retailer to grow to $2.5t company. It was just coincidental that Bezos was involved. Plenty of companies grow at this pace for this long.
Is it a good thing for society that Amazon grew that large?
I think it's pretty clear at this point that it's not.
His contribution doesn't have to be worth zero to be not worth more than all the engineering and physical workers under him combined.