Practically, though, politicians determine how, when, where, and why the money is spent. Just because it sits in a bank they don't directly control doesn't mean they don't determine the fate of those collected taxes.
My comment that you replied to is calling out whywhywhywhy's comment as bad faith because it's conflating tax collection with corruption, but says nothing that's specific to taxing billionaires. Your comment also doesn't say anything regarding taxing billionaires specifically.