First: Elon Musk is going to fund clean water for people in Flint. Good news! Yes, Mr. Musk, this is a good thing you’re doing and we’d love it if you did more of it! All rich people, please do more of this!
Second: there’s discussion of Kylie Jenner’s mention in Forbes for being a near-billionaire. I’m less interested in whether she should be recognized as a “self-made” billionaire (clearly she is not) and more interested in the fact that nobody should hold that much money at a given time. A pretty young woman from a rich & famous family does not need to have that much money in her possession. Nobody should have that much money in their possession. We shouldn’t call them billionaires, we should call them money-hoarders.
First, pay your employees sufficiently. Make sure they have healthy working conditions and proper compensation including benefits. Second, pay your taxes. Third, give to charity that distributes wealth downward. Still have money left over after that, sure, fund space exploration. The point is, the bragging point should be in how much money has been donated, rather than how much has been accumulated.