Like, you’d enroll it by adding a DOB and the computer/phone/etc would just intentionally fail all compatible age checks until that date is 18 years in the past. To remove it (e.g. reuse a device for a non-child), an adult would need to show ID in person at Apple.
Government IDs could be used to do completely privacy preserving, basically OpenID Connect but with no identifying property, just an “isEighteenOrMore” property. However, i agree it’ll never happen in the US because “regular” people still don’t know how identity providers can attest without identifying, and thus would never agree to use their government ID to sign into a pornsite. And on top of all that yeah nobody trusts the government, basically in either party, so they’d be convinced the government was secretly keeping a record of which porn sites they use. Which to be fair is not entirely unlikely. Heck, they’d probably even do it by incompetence via logs or something and then have people get blackmailed!
