Providing identity and access services at scale is certainly a few people's next big plan, and it appears they've managed to sell the representatives of their own states on it first.
This sort of thing can't happen except through the largest tech companies in the world, who are coincidentally already poised to be the world's official providers of digital identity, and private internet enclaves.
Look at what Microsoft has done with Windows - mandatory minimum TPM to install and a Microsoft account registration for a local user. Try using an Apple iPad or iPhone without an iCloud account or adding a payment method. Google wants you to sign in with them, everywhere, aggressively. Cloudflare has been the web's own private gatekeeper for the last decade. Facebook's whole product is identity. IBM has sold surveillance, IAM, and facial recognition services for decades.
Instead of a clunky IP-based Great Firewall, imagine being able to render VPNs ineffective and unnecessary everywhere on the planet by a person's (verified national) identity. Click. Block and deactivate all members of group "Islamic State" on your platform. Click. Allow IDs registered to this ZIP Code to vote in this election. Click. CortanaSupreme, please dashboard viewer metrics by usage patterns that indicate loneliness, filtering for height, last assessed property values, and marriage status, and show their locations.
Currently, laws don't require age verification, just that ineligible parties are excluded. There's no legal requirement to card someone before selling them alcohol, and there's no reason anyone would need a depth map of someone's face when we could safely assume that the holder of a >5 year old email account is likely to be 18 if 13 is the minimum age to register with the provider.
Shifting the onus to parents to control what their kids do on the internet hasn't worked. However, that's a bare sliver of what's at stake here.