better yet how about they take enough for donation and decanter a portion out an do blood testing both to make sure the blood is clean but alsoso the individual is aware of they are free of X
This is already how they do it here (India). They’ll test all donations for a number of infections, and you can give them your mobile number / e-mail / postal address to inform you if they find something.
That already exists. It’s called arXiv, and is used by mathematicians, physicists and computer scientists. Everyone else has to pay up.