Is it unused? I assume he's not Scrooge McDuck - chances are whatever money he has is invested in something.
most billionaire wealth is unused. this is inefficient.
Most of their wealth is committed in stocks or real estate. Any "unused" wealth is just cash-in-hand, ready to be spent on themselves, or to be used in new investment opportunities.
It should still be taken from then by force and doled out to the poor and hungry.
A nation that doesn’t care for itself is one incident away from revolt.