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I don't think anyone believes that age is a perfect proxy. Just that it is good enough, and that any better solution is either much more difficult or impossible.
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> others still need protection at 16

Other still need protection at 30, or in fact in my opinion also a lot of people above 50 (that didn't grow up with the internet around) are not prepared for what is out there. Also there are parents that are "underage". Those are not considered either.

I agree it is a very arbitrary limit indeed, but it seems there is no other good proxy so for a lot of people it will be choosing the best worst option, at least that is how the argument in favor is brought forward.

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It's the same principle as the age of consent. It'll always be arbitrary, but that's still better than not having a limit at all.
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Arguably, all online content should be moderated - just because I'm 40 doesn't mean I want to come across decapitations and the like.
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Under the DAAA the parent can just lie about the child's age in the settings.
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