I've tried to stay out of this, mainly because I don't understand the need to have children that drives infertile people to distraction. There are so many children in the world needing parents, and so many would-be-parents, I just wish they could be brought together somehow.
These fertile embryos were created in an artificial environment using the genetic materials of two people who agreed to the process. One of the rules of this "in vitro" game is that the two contributors agree to every step before it is taken.
Only one of the two women is unable to produce a further embryo, so the problem is worse for her.
The CSA is a large unfeeling and inflexible government agency, and is compelled to compel the father of a child to be financially responsible for a child they have fathered, without exception.
Sperm is donated totally anonymously, and therefore the father of the child cannot be identified. I believe that there is a mechanism to prevent the children of sperm donors marrying close relatives, but don't know how it works.
I guess what I'm saying is that I agree with the legal decision, it is in the best interests of the majority of the participants.
Giok