I bet western media will just magically forget to mention that the parents have the final control over the system when they cover the story.
My kneejerk reaction would be that too many parents would just instantly opt-out for it to be effective, but the more I thought about it, the more I realised that a lot of people might just keep the default parameters. If I suddenly became a parent and didn't have a good concept of what an appropriate amount of time would be, I might be inclined to keep the baseline restrictions. Even if they don't, the government limitation could be good guidelines for them to base what they decide would work.
Seems like a good first step, 2 hours seems like plenty of time for high school students, at least during the week. I wouldn't necessarily mind lighter restrictions on weekends, but that would probably fall under the purview of parental discretion. No live-streaming for under-16 seems like a no-brainer that should be adopted everywhere honestly.