> Well, except for the important detail that KYC requirements don't preclude the need for warrants...
Banks and law enforcement frequently share data without caring about warrants. One example: if you send a $10K wire (in the US), your bank may voluntarily submit a Suspicious Activity Report. And since they may be liable if they choose not to report, but are not liable if they do report, guess which option they typically choose?
Banks and law enforcement frequently share data without caring about warrants. One example: if you send a $10K wire (in the US), your bank may voluntarily submit a Suspicious Activity Report. And since they may be liable if they choose not to report, but are not liable if they do report, guess which option they typically choose?