Who checks the recipient and their partner are suitable parents. How do you feel about facilitating the creation and birth of a child who may be subjected to a difficult, traumatic or otherwise to you unacceptable upbringing? I don't like the way a lot of people parent and wouldn't want to be a participant in helping them have a child. I can accept we are all different but I dont have to be a cog in the wheel.
What if they are racists or believe in physical punishments for young children, or think babies should be left to cry or they intend to send the child to boarding school age 7 or or etc.
If the research team are only involved the medical stuff then the new parents could be included solely on their eligibility of needing a womb. Who sets other parameters like age, income, housing, etc? Would you be as happy for your donated womb to be used to facilitate a 50+ yr old woman carry a pregnancy?.A woman who lives in a hostel and has a very low income? A relationship with domestic abuse or coercive control?
If I opt out then I am not part of any of the risk of being partly responsible for bringing a child into the world to live in circumstances I am not comfortable with.