Earlier quoted context omitted.
Liability? You want to make give parents fines for their children accessing Facebook at a young age?
No, I am just saying what policy will allow the legislators to achieve their goals. So if your goal is for the state to decide what is good or bad for children, then yes, giving parents fines when their children access 18+ content will motivate those parents to parent their children. That will be an effective way to achieve your goal. Other policies have issues with externalities (ignoring the inherent externalities…
And, like most such policies, will disproportionately impact the working poor.