They all ended up as hell-holes.
I'm not really interested in repeating that history.
It is not at all necessary for wealthy people to be benevolent in order to contribute to society. Nor do they need to be nice people, nor do they need to be unselfish.
The free market harnesses selfishness for the benefit of society. It's why it works so well, as excoriating selfish people.
For example, the Wright Brothers invented the airplane so they could get rich off of licensing the patents. Dig into it, and that's the bald, unvarnished, truth. They did get modestly wealthy, but were poor businessmen. Look at what their selfishness did - glorious airplane travel! Have you ever flown on an airplane? You're benefiting from the selfishness of the Wrights.
BTW, everybody is selfish. I am selfish. You are selfish. Everyone who says they are unselfish are selfish. That's what a billion years of evolution did to us.