Is that the point? Even if a mother could breastfeed but chooses not to for the most frivolous or silly reason, it's still better for the baby to be fed donated breastmilk than formula. So it's still a far better use than making ice cream out of it. Yes, ideally babies should get breastmilk from their own mothers, but it's not their fault if their mothers won't do it, even if they can. Like bone marrow donation - ideally a relative will do it, but if someone's dying, who'd say "Well, your mother and sister were both matches, but they refused, so I'll make bone marrow soup out of mine instead!"? (OK, another gross analogy. I'm on a roll today...) In other words: the mothers might not "need" it, but the babies definitely do.
I do agree that the infrastructure of milk banks is a problem, but there are plenty of people who arrange donation privately. It can be done.
Eavesdrop: I believe the theory goes that breastmilk is indeed vegan, because it's freely given. Don't know about the ice cream itself, though - does it have egg yolks in it? Breastmilk isn't that creamy, so I imagine they'd have to use egg yolks or cream to make up the richness... unless they just used hindmilk, or even separated the cream from the breastmilk? Fascinating thought....
What I meant was, how many women who "choose" not to breastfeed, would then go ahead and use donor milk?