Great idea! I'd love to see more data-centric nonprofits. The recent This American Life episode "I was just trying to help" discusses this with GiveDirectly. GiveDirectly points out that many many nonprofits are soliciting donations based on anecdotes and are reluctant to produce more data on their impact. I can only imagine that YC-selected nonprofits (and NGOs? Could this go global?) will be more data centric than the rest. Good luck!