alt Hacker News> why that man is personally rich. Even if it were a big source of revenue, that would go into Amazon's coffers, not necessarily his directly.
Jeff Bezos owns 9% of Amazon. So 9% of the expected value of the money going "into Amazon's coffers" indefinitely into the future is counted as part of his current "wealth." It's not money under his mattress.
Is your argument that people shouldn't be allowed to own 9% of a company that they started?
People should not be allowed to accumulate capital beyond $X, yes. What natural law means they should? Society created the conditions for that person to be so successful; in fact, the person only had the minor part in that success. Once you reach $X, you get a certificate saying you won at life and society is really grateful, and society gets the rest of the rewards while they dedicate their life to philanthropy or torturing kittens or whatever it is they do as a hobby.