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Period tracking app refuses to disclose data to American authorities
(www.newsweek.com)
This is a most excellent place for technology news and articles.
You can already be compelled to give up biometric data like fingerprint to unlock your phone, I believe. I give it less than a year before SCOTUS extends that to PINs. And yes, I am sure they will find ways to get it out of people. Or if not, at least they tortured you, and that's what they really wanted.
Assuming we have anything resembling rule of law at that point.