We could do so much more, but would we? USAID was just shuttered. There's every chance that money would go into the military industrial complex or something equally unpleasant.
Not defending billionaires as a concept (they shouldn't exist, and most aren't as philanthropic as Bill), but I will acknowledge he's doing a lot of good with his money.
They did the same with Star Trek: Enterprise. It finally picked up momentum in the fourth season when Manny Coto took over as show runner, then they killed it.