> Ok, I'll admit it, billionaires should not exist at all, there should be a heavy wealth tax that makes it hard to become a billionaire. Will a CEO work less hard if he (and his peers) can only ever gain $100M in net worth before a wealth tax on assets kicks in?

In my experience from having known a couple of mega-rich CEOs, yes. Even those who are not principally driven by the money or three-commas social signaling, they still want to leverage their accumulated assets into changing the world in some way. Take that away from them and they lose motivation, yes.