I agree it would be no problem. It would obviously be an enormous security problem. Apps would have to know the government ID of children. Nefarious entities could stage denial-of-service attacks against individuals.

Obviously China could do this. I am skeptical of the claim presented as hearsay without evidence.

If such a system exists, there should be easily found documentation for it.

I keep hearing about a "social credit system for all citizens" but have never seen evidence of its existence.