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US state laws push age checks into the operating system
(www.theregister.com)
This is a most excellent place for technology news and articles.
The real answer is to swap it. Make websites have a tag for the type of content they contain. Browsers can then be configured to allow/disallow different types.
You get a way better version of the same claimed benefit of parental controls (that we know is a lie in the current version), and we aren't forcing our identification to be uploaded to major hacking target sites with questionable security