Robert Caro disagrees. Power does not corrupt, it reveals. If you somehow became a billionaire, you'd be able to do whatever you wanted, which means we'd be able to see what you wanted to do. If you start acting evil once you get money, it means you were evil but unable to act on it until you had money.

Specifically about Amazon, Bezos made it because he wanted to cash in on the early internet with his own startup, leaving a Wall Street firm to do so. And, yes, we was a dick to his only employee, which is why the man quit after only 5 years.