Because no one would be that kind?
I don't think it's kindness, not to the babies it's not.
2-3 journeys, that is the norm
According to you, I think there are likely many stories out there we don't hear about. Ones that don't end well. I don't think it's 'normal' to have babies (or any baby) and keep giving them away. We know about some of the deaths, but the ones that end in miscarriage and the friendships break down, leaving the SM grieving the loss of both, or the ones who regret it but it's too late as she's already pregnant. And there are some where the women lie about being pregnant to extort money, or the CPs who exploit young women - note the age of the SM in this article, and the reasons why it didn't work out (according to the CPs, the SM isn't interviewed).
www.devonlive.com/news/devon-news/surrogacy-rollercoaster-endured-same-sex-4204574
I said that I guessed it was through an agency, thank you for clarifying that and making it clear it wasn't. I hope the woman who is the surrogate mother to your daughter isn't struggling in any way. I don't think we should assume she is doing it for 'altruistic' reasons because she's had a handful of sessions to assess her mental stability to assure commissioning parents she is able to give the baby away. That's not a deep dive into her childhood etc (and she could lie to a therapist who is there for one reason only and it's not about her.)
I have been reading a lot actually, from both sides of the argument (for and against, commercial and altruistic) for almost two years. Legal documents and cases, obviously the 150+ page consultation document from the law commission, the APPG minutes on surrogacy reform and lots of international information on how other countries deal with surrogacy including those who have banned it. I've just finished reading Renate Klein's book Surrogacy: A Human Rights Violation. I find it useful to read around the subject and not rely on the DM or womens magazines fluffy, "isn't it the greatest gift" type stories to get to the real stories. I've also seen many pro-surrogacy you tube videos from CPs and SMS, you'd be surprised how the baby or pregnancy is referred to, as if it's an abstract thing or the baby isn't an actual person.
I ask questions to learn more, and to get hear other people's views and experiences. Don't assume because someone disagrees with you they know less than you.
There's lot to learn from this board alone.
@scottishgirl98 might be interested to read this too
https://www.mumsnet.com/Talk/surrogacy/2188488-surrogacy-has-gone-wrong?messages=100&pg=1