Having a billion dollars means the rules no longer apply to you. That is incompatible with functioning capitalism—incentives are no longer aligned with the rest of humanity—or personal freedom—rules for thee but not for me.

Money is a made up idea that we use to benefit everyone. It's a game that, largely, has positive returns for society. When that is no longer the case, when someone breaks the game and removes themselves from the rules, you have to change the rules.