The impact of trauma and attachment on rupturing the mother/child relationship at birth is well known and well studied.
This is intentionally creating a child with the flat out intention of subjecting them to that trauma because an adult 'wants a baby'. It is creating a human being where fundamental damage to them is part of the plan.
The emotional problems and mental health struggles of adopted adults are well documented where those adults explain in depth growing up under pressure to be grateful, to exist to meet the adult need, and to not think of or speak of the birth parent that they are told is irrelevant, unimportant, flat out inconvenient in some cases: that is the child's genetic history there. In cases of adoption, this was the least worst option for the child; adoptive parents are told in training from the start 'this is no one's first choice: not yours and not the child's'. They are made very aware that the child is not a blank slate and the child is coming to them grieving, with losses. In this case, all these losses and harms are blown aside and not mentioned. Because an adult wanted a baby.
Adults using surrogacy are willing to take this risk with another human being - one they plan to love - in the hope that it will work out ok and their child turns out to be one of the lucky ones who didn't suffer trauma or long term distress and difficulties because they wanted, and they deserved it, and it wasn't fair that they couldn't have what someone else could. Some of those children will be ok. Some will not. Is this ok so long as the adults had the baby experience they wanted to have? They get what, a few years of the cute instagrammable bits and about two decades of the parenting experience before the person they created has another fifty plus years to live with themselves and any challenges.
It's the same argument as do we hand out puberty blockers and mastectomies to kids, because while some will have their lives destroyed, some will probably turn out happily.
And in adoption, parents are vetted very carefully as to their suitability to take on and care for a child who has suffered this rupture of attachment and loss. Commissioning parents are not vetted at all.
Ethics. Morals. Human trafficking. Children's rights. Commissioning, buying and selling human beings.