[zapdrive]

I don't think the location aspect is what is important to the government, rather it's the "who met who, and when" aspect.

[lrem]

Which is exactly why the protocol is:

1. Your phone transmits a temporary random number. 2. Your phone stores, but never uploads, list of all the numbers it has seen for a prolonged period. 3. Your phone downloads daily a list of published numbers and cross-references that with the local list.

Literally the only time you upload anything is when you report being positive.