Those critical of the Chinese government should take a look in the mirror. Governments around the world, including those in the US, routinely impose restrictions on minors' ability to access online content. These laws are even structured in a similar way: hold the service providers accountable for monitoring use.
> "Teenagers are the future of our motherland," Xinhua quoted an unnamed NPPA spokesperson as saying. "Protecting the physical and mental health of minors is related to the people's vital interests, and relates to the cultivation of the younger generation in the era of national rejuvenation."
It's a favorite tactic of authoritarians everywhere: "Just think of the children!" First get a foothold by selling the thing as protecting children. In the US, we have two other options: terrorism and drugs. With the precedent set, expand the policy and watch opponents scramble to find a foothold.