My view is that this must be left entirely to the parents. The only time a government should be allowed to interfere is when there are child abuse or neglect cases against the parents and the children are put under child protective care.
It is in my view crazy and irresponsible to allow the government override the parents' decisions about what media their children can consume. It is guaranteed that this power will be abused.
The CA/CO law is literally the government writing a law that says it shall be left to the parents but the device must give the parents the options they need.