This gets to the core of the question! How did a rich startup person get wealthy anyway? They built something that people wanted. People said: "hey, that thing you built, I value it at $20 and you're giving it away at $10, so I'm happy to buy it!" Anyone who made money from business has already created wealth and contributed to society, via the market.
To the people who would disagree with me-- Look at your surroundings. Do you feel oppressed by the manufacturers of your laptop? Do you feel like you have no other option but to buy a $5 latte at the coffeeshop you're at? Are you being held at gunpoint by your new-used car? Do you wish the refrigeration oligarchs never existed? No! You are getting _insane_ value out of these relatively cheap items. Your $5 latte couldn't even exist a century ago. So it's okay that all the people who worked 40 hours a week to bring you your gadgets get a cut.