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Stop Killing The Internet: No Digital ID & No Age Verification | European Citizens' Initiative
(citizens-initiative.europa.eu)
This is a most excellent place for technology news and articles.
nothing should be signaled to any service. the service should signal its age limit, and the local software needs to compare the limit with the user age. that too could happen on a per content basis, I guess HTML or CSS could be extended with a new property for that.
then, if the user age is below the limit, the browser should continue loading the page as usual, but hidden from the user, to avoid introducing a new vector for fingerprinting.
or even to government services portals that did not require personal identification.