This is a bad way to measure philanthropy, and I think Bill Gates would agree.

Anyone can dump money on a problem. But Bill Gates's money is still finite, and he has tried to make his money be the most efficient at solving given problems. He measures the stuff he does and sometimes finds out he goofed.

I'm not exaggerating when I say he's likely one of the top 5 people in the world at knowing how to spend billions of dollars to help people, because he has the most motivation of anyone in the world to know how to best spend billions of dollars.