I do not entirely disagree with the principle behind what you are saying. The problem arises with the example you use — or any similar example for that matter. Jeff Bezos does not own $153 billion. He owns shares in the company he created. The current value of those shares is $153 billion (actually, that’s an estimate because the value of shares fluctuates minute by minute). To actually access that money he would have to sell those shares. If he did so, their value would immediately crash.
But you are right to point out that he controls the company and is ultimately responsible for the low wages and generally poor working conditions in his warehouses. It’s not his billionaire status that is the problem, it is, as you rightly say, the system that is the problem. And with the power he holds he could change the system but doesn’t.
It’s having such power in the hands of one person that is the problem.