Adoption (these days) is not a robust process for giving children away
it exists for the good of the child who needs a family, because we have finally taken off the emphasis on punishing unmarried mothers and correcting their children. We now acknowledge that open adoption is healthier than closed. We now see that institutionalised childhoods in what we used to call an orphanage is a very damaging start in life for children. So wherever possible we try to find suitable families for children to grow up in. Adoption rightly has very stringent rules around it, eg as to who can adopt. In the UK that’s not something paid for in a commercial way.
So it’s not that adoption is or was a system created for the benefit of women or at their request. If a woman had babies just because she wanted to help and support other people who might like to be given a baby to bring up, that woman would be deemed dangerously irresponsible and mentally unwell. I’d assume that her existing kids would be subject to social services involvement. Any babies she birthed for the purpose of relinquishing would be taken at birth by social services and put into foster care until legal adoption could be arranged for them. The woman would be treated for serious mental health problems.
My point is that the social contract that we understand as ‘surrogacy’ is only ever legitimised as such by the desires of the intended parents. Never by the woman’s wants. We no longer consider her actions as ‘surrogacy’ if she deviates from the IPs‘ requirements or stipulations around the pregnancy.
Like: imagine she insisted on giving the IPs something they didn’t want- pregnancy with a different baby because she used a different egg or sperm than the IPs wanted, or if she gave them another already born young baby instead. Or imagine if she changed her mind about which IPs she wanted to help and gave the baby to a different person or couple instead.
So although surrogacy obviously has an element of bodily autonomy and the woman’s choice around it, it is in not actually built around the woman’s wants, and it’s wrong to present it that way. She is instrumental to others achieving their desires. This is why there is a lot of concern about women’s interests and welfare and rights when it comes to women providing surrogacy for other people.