Handing over a phone is certainly cheaper than paying for extra childcare, though most likely much less healthy for the child.
I suppose idea is that Chinese women will stay at home with the child so the state doesn't have to provide any help?
More like the state (at least in places like USA) cracked down on children roaming freely so now people hide their kids inside playing video games so a Karen doesn't call CPS when mommy has other things to do all day besides play helicopter parent staring down at their kid all day.
The gov does provide some help. But a clearer trend is a lower marriage and birth rate