It’s extreme, but it’s also not surprising. The Chinese government is known to impose such restrictions to change the culture and lifestyle.
To be fair, I understand it, though. I’d rather children limit their time with playing games and do something else instead. They should be going outdoors, getting exercise, getting their vitamin D, and building a healthy foundation for themselves. They’re still growing; they should maximize their potential in terms of physicality and health.
I think that's exactly the reason why they're setting the restrictions.