No, I did not introduce cows into the thread, in fact I dislike the comparison as it is dehumanising. Have a re-read through the thread, it wasn’t me.
So you didn't say ' The point is that it is entirely possible for one cow to feed two calf’s just like it is entirely possible for one woman to feed two babies. '?
Which I then pointed out that it can back fire and cause that the cow's calf to suffer. You then agreed you were not an expert and so did I.
You said "I am saying, that why would a mother deprive her child deliberately of an extended period of their breast milk ( unless they were a) being exploited financially and b) giving a small amount as a donation for a limited time."
Again, you are wrongly assuming that the mothers own child would be deprived if the mother were to sell or donate excess breastmilk. Historically, with wet nurses, the wet nurses own child was not deprived but grew up as a milk brother or sister to the aristocrats child that she also nursed. Women giving excess milk away or donating it usually do so in even smaller quantities that the amount needed to entirely feed another infant, do again, he child is not deprived in any way. In addition, many mothers of twins do successfully feed both babies and neither baby is deprived.
Your fear of deprivation is a constructed narrative. It did not usually happen historically, doesn’t usually happen now, so why would it happen in the future?
You keep seeming to try to push 'breastmilk seller's' infants onto formula to be able to produce this milk. You also seem to be consistently ignoring that breast milk can be stored for extended the breast milk feeding for that child.
And why would you deprived your child of extending out their breast feeding?
You speak about 'historical' instances. Freezers were not invented at that time. So, again, why would someone chose to deprive their child of extending access to breastmilk to sell their milk if they were not being exploited financially?