Look at the qualifications for fostering a child. They vary by country, but in general you have to go through a background check. You have to be vetted by a government authority to ensure your home will be a healthy environment. You have to be able to demonstrate a secure income and ability to meet the material needs of a child. When you get it, you'll be closely monitored for a time. Right now there's a family in the US taking legal action against the state because they believe in corporal punishment as a religious requirement and the state requires potential foster-parents sign a 'no violence' agreement. These are the standards which society has decided that a person must meet in order to take on the difficult, dangerous and vitally important task of raising a child.
Or, on the other hand, they could take the other route: "I got's me a pair 'o balls, guess that means I'm-a qualified to be a daddy." A standard that any idiot can meet, often accidentally, resulting in a great many children being born into families that do not have the support, resources or education to raise them.