I mean having the winning idea at the right time, being both lucky and innovative could lead to someone becoming a successful billionaire without necessarily acting immorally. That being said, most of the billionaire class were born into wealth/connections or did act immorally to get there. But I think rather than focusing on the harm it potentially took to become a billionaire, isnt as important as focusing on the fact that simply hoarding that amount of wealth is in itself the act that is immoral. Whether you fucked people over or not to get there should largely be irrelevant. Once there, you have a moral obligation to put money back into society. Whether through philanthropic means, taxes, etc. but as we should all be aware by now, the vast majority of billionaires, despite having more wealth than they could spend in several thousand lifetimes and massive unchecked power/influence on media and politics, they are never satisfied. They continue to hoard more and more money, which is a finite resource, leaving less for us as individuals or as a collective society that should have more and better entitlement programs/social safety nets.