IMO, greedy founders are a symptom of greedy investors. Investors pick the companies very carefully, which means they pick founders very carefully. The average investor is not going to fund the altruistic charitable dreams of a founder. Thus, if you want to succeed as a founder, you speak the language the investors want you to speak. You want money. You want to pivot 5 times until you find product market fit, get big enough to attract attention, and sell. Doing what? Who cares, the point is the money.

I think investors are the start of the cycle. If they wanted a different breed of founder, we'd all be singing a different tune, here on this webpage and elsewhere.