Realizing that much of the internet is totally toxic to children now and should have a means of keeping them out is distinct from agreeing to upload ID to everything.
A better implementation would be to have a device/login level parental control setting that passed age restriction signals via browsers and App Stores. This is both a simpler design and privacy friendly.
At least here in US: Google/Apple device controls allow app to request whether user meets age requirements. Not the actual age, just that the age is within the acceptable range. If so, let through, if not, can't proceed through door.
I know I am oversimplifying.
But I like this approach vs. uploading an ID to TikTok. Lesser of many evils?
parents need to start parenting by taking responsibility on what their kids are doing, and government should start governing with regulations on ad tech, addictive social media platforms, instead of using easily hackable platforms for de anonymization, which in turn enable mass identity theft.
No, I think both ideas are bad.