Here's how much of their wealth the 10 richest Americans gave to charity in 2018: Ellison: 0% Page: 0% Brin: 0% Bezos: 0.1% D. Koch: 0.1% C. Koch: 0.5% Zuckerberg: 0.7% Bloomberg: 1.5% Gates: 2.6% Buffet: 3.9% Billionaire philanthropy will not save us. Tax the rich.