This “billionaires couldn’t spend their money” thing comes up a lot, and it show’s a child’s idea of what people might spend money on. “$1000 a month buys more ice cream than I can eat and more toy cars than anyone can play with, and I don’t want anything other than ice cream and toy cars, so nobody needs more than $1000 a month.”

I can think of loads of things I’d do with hundreds of millions of dollars of disposable income. Make large buildings that look like how I think buildings should look, fund scientific research in areas I’m personally interested in but have little aptitude for, find artists that align with my tastes and give them the ability to realise their visions, contribute to political organisations and charities that align with my values, et cetera. Those all are basically infinite money sinks.

In the past, the ultra-wealthy did do all of these things, funding loss-making research and expeditions, monumental architecture, philanthropic organisation and artistic works. The problem might be that you think billionaires shouldn’t do some or all of these things, but that is a very different position than that they can’t do any of these things.