At a certain point you're responsible for a person, and not hosting a mass of cells. If the fetus is viable, then abortion is essentially the same as delivery, and you're looking at adoption instead of abortion.
I'm sure there's edge cases that I'm not thinking of, and I'm perfectly willing to admit I'm wrong, but it seems to me that if the fetus is viable, then there's not much difference between a human that's inside the body or outside.
https://letsencrypt.org/2025/07/01/issuing-our-first-ip-address-certificate/