If the parent gives in to a kid just because they raised a fuss about it, they have more issues than just the amount of time that child is spending online. 0
The government can't single-handedly raise your child for you (short of some more extreme circumstances). They can help, they can give guidelines like these, but ultimately you are responsible.
I think having these restrictions will help a lot parents, especially new parents, have a good baseline to work with. If your kid is doing wonderfully in school, afterschool activities and wants some extra time online, maybe you can scale up their online free time. Grades start to suffer? Scale it back down. Your high school kid has a passion for app programming? Maybe you uncap their online time because it isn't just about online gaming for them.
One size doesn't fit all, and I think it's a good middle ground.