Me and my wife were actually joking the other day that at some point there's going to be a human milk industry. We envisioned something similar to the places you can go to sell your blood plasma.

There already is a network of sorts where lactating moms will donate milk to hospitals and mothers that can't nurse for whatever reason. [1]

[1] https://uichildrens.org/mothers-milk-bank-iowa

There was that human-milk ice cream in the UK around 2011:

https://en.wikipedia.org/wiki/Baby_Gaga

I don't know how well that turned out.

I am anecdotally aware that human milk for infants goes for $5/oz (which seems crazy when you tally up how much milk an infant can drink in a day).

Call me an anarchist, but as long as it comes from a mammal I have no problem with it being labeled "milk".

I detect an anti-marsupial bias.

Marsupials are mammals.

Yep. Labeling things milk that resemble milk is not a recent trend and I think it's a shallow excuse for people to attack non-dairy milk. Those people have no problem with milk of magnesia, milkweed, or milk thistle.