> Once covid19 goes away (if ever), and a new virus appears, NO ONE will have that app turned on, and by then, the new virus will have spread just like covid19.
Devil's advocate: so why not just keep the app running forever in the background?
If there's no virus to report - that's fine.
But the moment a new outbreak starts, the data is already there, you just have to report that you're sick.
Absolutely, and if it is indeed local only and encrypted until you say you are infected, it could be part of HealthKit and Android equivalent (don't know if it has a name)