Comment by riezebos

That is a practical problem, but it does not apply to the proposed solution. The proposed solution is an organization whose purpose is literally to do the vetting for you. You only need to vet GiveWell, you can then outsource the rest of the vetting to them.

From their website: "GiveWell is a nonprofit dedicated to finding outstanding giving opportunities and publishing the full details of our analysis to help donors decide where to give."