[cjbprime]

> Would you suggest that we not have public health departments engage in contact tracing at all to combat the pandemic? If so, I'm not sure what to tell you.

It's fine, but as Jean Yang pointed out on Twitter, no-one would ordinarily call disclosing everyone you'd shared a location with over weeks "privacy-preserving". And once you've done it for some large fraction of infected people, you end up with a country-wide social graph built up, even though you weren't conducting mass surveillance in the usual meaning.

It's a loss of privacy either way (whether done via location or Bluetooth contact). I'd rather just have the conversation about how we've decided to suspend physical metadata privacy to combat the pandemic, than act like the Singapore model is going to preserve it.