Why is Zuck worth $28.8 billion? Private property rights and a tremendous success. How do you know he's just going to sit on it? You don't, which null and voids your entire premise.
Spreading money out, ie redistribution of previously existing funds through service based consumption industries, is a very mediocre example of "keeping the economy going." Production is what bolsters an economy, not consumption. The faltering US economy has been demonstrating how that works in practice for decades, while China's production-centric economy demonstrated the exact opposite (and the same principle that the US economy was originally built on: production creates wealth, consumption destroys wealth, which is easy to deduce logically).
And sitting on wealth is a tremendously benevolent thing: it removes that purchasing power from circulation, boosting the net purchasing power of every other person holding, for example, dollars. If Zuck puts his $28.8 billion in a bank account, it does two wonderful things for the economy: it becomes available to be lent out by the bank in question, to help fund businesses or similar, and it temporarily removes $28.8 billion worth of dollars from the economy, increasing what other people's dollars can buy.
Spreading money out, ie redistribution of previously existing funds through service based consumption industries, is a very mediocre example of "keeping the economy going." Production is what bolsters an economy, not consumption. The faltering US economy has been demonstrating how that works in practice for decades, while China's production-centric economy demonstrated the exact opposite (and the same principle that the US economy was originally built on: production creates wealth, consumption destroys wealth, which is easy to deduce logically).
And sitting on wealth is a tremendously benevolent thing: it removes that purchasing power from circulation, boosting the net purchasing power of every other person holding, for example, dollars. If Zuck puts his $28.8 billion in a bank account, it does two wonderful things for the economy: it becomes available to be lent out by the bank in question, to help fund businesses or similar, and it temporarily removes $28.8 billion worth of dollars from the economy, increasing what other people's dollars can buy.