I think they don't so much "remove" them as that billionaires tend to not have their money as "wage income" like the rest of us plebes.

They get "stock options", which occasionally they can cash out, and then THAT counts as income, while the rest remains in the digital ether where it just auto-magically grows and grows, at the expense of all the wage-earners.

So they aren't "earning" more (wages) than us, so much as they are treated as an entirely different type of being (capital).