Well, i don’t think these women get pregnant just to make content and dispose their kids afterwards, if that is what you are implying.
Keeping your kids out of your costumers view after birth seems like the most responsible responsible parents would do, don’t you think? Especially since a lot of them get a little over attached.
A lot of women just want to keep their functioning carriers and have a family. And why not produce content when some people seem to pay extra to watch pregnant bodies?