If you knew that in the last week you passed someone with COVID, what would you do differently? Answer that question and you have your answer to wanting to be tracked. Of course this assumes that everyone who is COVID positive is being tracked which certainly they are not. It assumes every COVID positive person knows they are positive whereas we know most have no symptoms. We see on this thread that lots of people don't carry a phone or have tracking off.
Instead just behave as if within a week you are not unlikely to pass someone who whether they know it or not is contagious. I don't see what the proposed nearness requirement for a warning would be here, but if it is 100 meters in S Korea, that is 330 feet. A football field, not including end zones, is 300 feet. Do you think you won't pass within a football field of a COVID positive person while this is still ongoing?
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