Funny, I remember contacting the Gates foundation many years ago now about chronic illnesses and the then-new discovery of ipRGCs/pRGCs (which we will find have a critical role in Alzheimer's) and hitting a total brick wall. Paraphrasing them, "this wouldn't help the third world" - we know better now.
I’m making this investment on my own, not through the foundation. The first Alzheimer’s treatments might not come to fruition for another decade or more, and they will be very expensive at first. Once that day comes, our foundation might look at how we can expand access in poor countries.
It's intriguing they're able to draw that line, but it makes sense if they want to keep the Gates Foundation focused.