It means if you want kids (or even pets) and you want to adopt, there are all kinds of hoops you have to jump through in order to do it and it takes a decent amount of money. Breeding your own (kids) is free. It costs money down the road, of course, but you can do it low-budget if you need to. I think it would have only been in the last few years, if then, that my husband and I would have been allowed to adopt.
Our kids are all nearly grown (15-21) and are not criminals or delinquents or anything. We aren't amazing parents but we are adequate, but we wouldn't have been allowed to adopt until we were nearly middle aged.
Also, not everyone is physically or emotionally equipped to handle special needs kids or kids that have already been subject to years of neglect or abuse. Kids without issues, especially young, white kids, are very high demand.
We rolled the dice and got two out of four white babies with no issues. Two have autism, one mild, one moderate, but that stuff is pretty normal for our family (my husband is likely autistic and our moderately autistic kid is a lot like him, so we can both deal).
At this point, I'm not against the idea of becoming a foster parent, but the six of us live in a two bedroom house with a leaky roof and no furnace (we paid cash for it after we lost our house in the recession). We could throw another set of bunk beds in the kids' bedroom, but I don't think we'd pass muster for a home inspection from the folks that hand out foster kids.