Regain your privacy! Adopt /e/ the unGoogled mobile OS and online services
Nah, we could simply tattoo a serial number or QR on the inside of people’s arms. This tech has been around for quite some time…
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… or even print it on a piece of paper and keep it in the wallet. Too old fashion ??
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Apart from some basic no-brainer things to keep us alive (*), the answer to every “Do we really need …” question usually is “No, until proven otherwise. The question is just worded wrong, or click-bait, or asked with an agenda in mind.” 
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(*) Unless the question is “Do we really need to be alive? Join us as Earth and the military-industrial complex share their fascinating insight. For a start.”
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No, we have smartphones already…
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