I'm just looking at what Wikipedia says Zuckerberg is worth but it's $69B. Looking at what Forbes said his charity (which does not mean 100% his money) they donated $410 million in 2018. That's ~0.006% of his wealth meaning it's not even giving away a penny out of $100. It's close to half a penny out of $100.

I understand net worth of $69B is on paper but none of these guys are philanthropic.