... But: our visibility of "what he's doing" probably isn't very good, so our estimates of "why he's doing it" may actually factor into our guesses about what will actually end up being done with the money.
Our reaction to his donation isn't only about guesses about what will actually end up being done with the money is also about shapping cultural values. If the press reacts negatively to billionaires giving away their wealth that disincentivies further donations from billionaires.
I agree. (And, in the other direction but I think probably much less important, if the press responds with uncritical adulation when a billionaire gives the impression that he's giving away lots of money, without anyone checking what he's actually doing with it and whether it'll do any good, that incentivizes donating billionaires not to bother making their donations actually do much good.)
Mark Zuckerberg annouced that he is going to give away 99% of his facebook wealth ($45 billion) over his lifetime.
He announced guiding questions:
It's interesting that "live much longer and healthier lives" is on the list. Larry Page seems to divert money inside Google into Calico for anti-aging tech. Under Cook Apple also invests into health.
The future seems looking good :)