Even if it was hoarded as cash, this shouldnt matter. Less meal tickets floating around means that the each ticket gets more food. If Bill Gates is using the money for consuming resources(say making a huge building), this affects the economy as there is an opportunity cost(the consumed resources could have been used elsewhere). One exception is monetary crises where hoarding has a negative impact, but thats not the usual situation.

There is a strong case for redistribution of wealth on its own terms and social good.