If you think rich peoples wealth is in a form that can be redistributed to the poor (ie cash), then yiu are seriously deluded. The wealth of someone like jeff bezos is essentially the amount us poor people are willing to pay to be in charge of Amazon. It does not refer to any kind of cash which he can give away. Moreover, giving away his shares would simply lower the value of Amazon since the reason why those shares have any value is the business bezos runs