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But they use that information for identity verification. Virtually every company uses this excuse to collect PII when they can neither guarantee protecting it nor actually verify against fraudsters. That is a faulty system screaming for more secure technology like zkp.
"Identity" is very different for very different kinds of relationships. Phone company "identity" for their own billing purposes falls far short of being a secure way to maintain a relationship where one person is trusting another with $100,000s worth of bearer assets.
