People say this, but I'm not sure I understand how it could be true. For example, taxing billionaires is often cited as the solution to this problem. But if we took Elon Musk's $730 billion fortune and divided it evenly among the US population, people would receive a one-time payment of about $2000, and then that fortune would be gone, and any opportunities or advancements it was creating. So I'm genuinely curious where you see this incredible excess coming from.
It also misunderstands that nature of Musk's fortune. He's not Scrooge McDuck and they pretend he is. Sell SpaceX at a fire sale. What's it worth? A lot less then it is now. Who would buy it? Poor people? Somehow I don't think so.
Musk is a golden goose and there are people who think the best move is to cut him in half and get at all the gold inside.