An article titled, "Draconian policy measures are unlikely to prevent disordered gaming from the Journal of Behavioural Addictions sheds some light on this and I think it's a good read. From the article:

"Videogame play is normal for children worldwide, and like other leisure activities can lead to benefits for the majority and problems for a minority. Problematic or disordered play results from the interaction of multiple risk factors that are not addressed by draconian policy measures. Identifying these factors through stakeholder-engaged research and current evidence will be much more likely to succeed in preventing disordered gaming and promoting youth wellbeing."

I think that these policies may actually have backfire effects, as it decreases access for younger individuals without them developing self-regulation skills of playing that they might learn more naturally without restrictions. By removing access to games so heavily, it might increase the perceived value of games which makes it a bigger problem for the population that are more prone to problems in the first place. I think policy related to teaching kids regulation skills (including regulating ones own gaming) can be applied more widely to a host of different problems, would be less paternalistic and have fewer potential backfire effects.