Attributing that whole reduction to Gates alone is a ridiculous thing to do. He didn't even fund most of the project and the only thing he really brings to the table is money. This has been a multinational effort with literally millions of people for 3 decades. Gates mostly wrested control from them in the last decade.
If he manages to bring the project over the finish line, I will celebrate his achievement. At this point, signs point to failure of the GPEI being a near certainty. Unfortunately, we'll be back to 400k in about 10-15 years if we give up at this point.
That's amazing and I am very happy I live in a world where someone helped that many people, regardless of who you compare their accomplishments to.