[RI mom, whose child is higher risk, pleased Pfizer is seeking FDA approval of COVID vaccine for younger kids] Li Zhanguo’s two children, ages 4 and 8, don’t have their own smartphones, but like millions of other Chinese children, they are no strangers to online gaming. “If my children get their hands on our mobile phones or an iPad, and if we don’t closely monitor their screen time, they can play online games for as long as three to four hours each time,” he said. Not anymore. Like many other parents, Li is happy with new government restrictions that limit...