Heh, those charities--and other billionare "giving"--cause more harm than good. There's a mountain of evidence to back that claim up (surprisingly, many of these uber-rich people are aware of these criticisms and even admit that they're not doing much good):
https://www.amazon.com/Givers-Wealth-Power-Philanthropy-Gilded-ebook/dp/B01ILZT6V4