Google can probably infer what I had for breakfast from
the way I move the cursor. Can't we have ID-less age verification somehow? Sure, it won't be 100% accurate but keeping out 90% of the kids is a win.
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It has a terrible false positive and false negative rate.
So it's not just a matter of it "keeping out 90% of the kids"; it's a matter of it decreeing that due to unknowable factors, and with no ability to appeal to a human, you are 13, and are no longer allowed to access large chunks of the internet.