"unboundedness of the greed of a few"
Lots of people claim "greed", but the stereotypical Tech billionaire doesn't simply roll around in gold like Scrooge McDuck, doing nothing and demanding more. They invest and reinvest it into new enterprises.
Of all the ways of dealing with massive wealth, this is probably the second least disruptive one. (The first one would be just giving it to honorable causes.)
They claim greed because they always choose the path that makes them more money even if it has clear, evidence-based proof of societal harm.
Ya know, just like the Sacklers and pushing oxycontin.
You don't know in advance what is going to make you money. Investments are risky.
In 2026, we know that SpaceX is a huge success. In 2002, it was just one of very many space startups, the vast majority of which ended up bankrupt, and before the last Falcon 1 flight, it was already on the brink of bankruptcy. They were incredibly lucky that the last rocket they had money for actually reached orbit.
During the same time, John Carmack invested into Armadillo Aerospace, and lost money.
Was he less "greedy" than Musk only because in retrospect we know that one didn't pan out and the other did? Or were they both simply risk takers in an uncertain field, motivated by a mix of incentives?