Ask HN: Why IBM World Community Grid bans Donors from Cuba, Iran, Syria?

IBM World Community Grid (worldcommunitygrid.org) claims that it enables anyone with a computer, smartphone or tablet to donate their unused computing power to advance cutting-edge scientific research on topics related to health, poverty and sustainability.

I also wanted to contribute some processing power to help fight Cancer, but I guess my laptop doesn't qualify because of my citizenship.

https://www.worldcommunitygrid.org/stat/viewStatsByCountryAT.do?sort=members

What are some non-for-profit organizations that allow any human being to contribute and donate CPU-time for the sake of mankind, without being rejected because of his nationality, skin-color, or religion?