That seems to me like an overly consequentialist view of charitable giving (as is common among the "effective altruist" types). It's possible that billionaires

That seems to me like an overly consequentialist view of charitable giving (as is common among the "effective altruist" types). It's possible that billionaires have an obligation to give back to society as soon as possible, even if waiting to make more money would result in more total donations in the long run.