You don't have to love Gates or everything the foundation does to recognize that putting billions toward global health and poverty is way better than setting up a dynasty or letting it sit in investments
In the 50's the Congress in US was getting suspicious about those foundations already. There were a investigation for it:
https://en.wikipedia.org/wiki/United_States_House_Select_Com...
Depends on investments. Arguably tech advances are more effective for alleviating hunger than direct food donations long term.
I havent looked, and frankly can't be bothered [0], but I expect that even after giving away an unfathomable amount of money, the foundation and gates are probably richer (dollar net worth) than they have ever been.
It has been sat in investments, they have been giving it away, but they can't keep up with it.
[0] Turns out I could be - https://www.bloomberg.com/billionaires/profiles/william-h-ga...