Matching for platonic co-parenting: "like a divorce, without the wedding or the arguments."

The WSJ has the story, about two web sites that are trying to pioneer matching for people who want to conceive a child who will have two involved parents, who won't be married to each other:

Co-Parenting Sites Skip Love and Marriage, Go Right to the Baby Carriage
A new kind of online service matches people who want to have children, but not necessarily romance 
By Julie Jargon

"When Jenica Andersen felt the tug for a second child at age 37, the single mom weighed her options: wait until she meets Mr. Right or choose a sperm donor and go it alone.

"The first option didn’t look promising. The idea of a sperm donor wasn’t appealing, either, because she wanted her child to have an active father, just like her 4-year-old son has. After doing some research, Ms. Andersen discovered another option: subscription-based websites such as PollenTree.com and Modamily that match would-be parents who want to share custody of a child without any romantic expectations. It’s a lot like a divorce, without the wedding or the arguments."
...
"Given the prominence in today’s society of both single parenthood and online dating, this digital approach could be seen as a natural progression. It could also be considered shocking or even, as some have called it, an affront to marriage.
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Here's Pollentree.com: https://www.pollentree.com/, which also offers to match prospective moms with sperm donors.

And here's Modafamily: https://modamily.com/, which speaks of romantic, co-parenting, or known-donor relationships.