Is this for women who want to give birth or want their child to still be partly their partner's?
Donation is giving for free, no? This sounds more like...selling.
I wouldn't like it unless I knew I'd never wonder what they're up to (or if they have grown at all). But there are places here where you can be contacted down the line if your spermatoza bombastica is used to make new people. I can't know I wouldn't think about it too. It's still a connection to me so unless I could properly sever that, legally and psychologically, I'd try to find other ways of acquiring moolah.