Uh, isn't this a good thing? A successful businessman granting private money to help the world? Yes, poop is everywhere, but it DOES spread diseases in 3rd world countries (you know, where these are intended to be used to start, as I understand it). Why are you all putting down a drive to innovate using, again, PRIVATE grant money?
And you ask how people in these countries will afford it? Again, that's the point of the foundation... they give it to them. When people have the ability to be healthier and safer, it is MUCH easier for them to be more productive, educated, and aware of their political situation. This is sure a better way of spreading the ideas of freedom than guns and bombs are.