Well if you go by FDA's Title 21 Chapter I Subchapter B Part 131 Subpart B then not only is human milk not a dairy product but the only animal who produces milk is a cow, however in 2018 they requested submissions weighing in on whether plant products should continue to use "dairy group" words such as milk and yogurt on their labeling, so I think there is probably some leeway on this.
It's not actually especially difficult. People who produce more than their kid needs will sell or give away the extra to people who are struggling to produce enough.
Also... Some hardcore body builders buy it as well.
By definition, "warm blooded" means "produce their own heat" (obviously drastically simplified). I don't think it matters whether the coconut is on a deserted island or on the shelf at Woollies, it's still not warm blooded.