Think about it. 1 Billion. A person who lived 100 years would have $27,397 a day to spend. Including as a newborn infant.
At Bezos levels? roughly $5.3 million a day.
What could you do with 5 million a day? Well for the first 3 months of your life as a newborn, not much probably.
But as an adult certainly, you could find ways to spend it right? Great. Society would love to see some cash splashed around. The economics people always love to see money sloshing around society.
So why can't these people simply stop accumulating and start letting it flow? They'd get to enjoy it. Their society would benefit from it. It'd be good for everyone.
The more these people are forced to spend down their wealth - however they want to! - the better.