It is an interesting question. I would gladly donate, and I guess I'd accept milk from a mama I know, but since we are overseas I don't know if I'd be comfortable taking it from a stranger unless it were screened, just from a safety standpoint.
Yesterday I offered to pump for my neighbor's baby who is FF and was constipated. I don't know if it would help but I thought I'd offer anyway. Mama didn't want to give the baby juice or baby prunes this early and breastmilk was the only thing I could think of that might help (thinking of those runny wet BF poops!). She declined but appreciated the gesture.
You have now got me thinking. I may look into donating here. It is something small I can do for another mama and baby that would have a big impact. Thanks for the idea!