I live in Québec. We never had mass tracking - this was FUD about the app, which did NOT share data... and that level of privacy protection is also why it was difficult to prove its positive impact.

What we did have was public health which sometimes managed to call people after a positive result - to warn their contacts, so they don't infect others in turn. This is absolutely standard for public health for many illnesses, and helps reduce contagion.

Neither of those is mass tracking. Public health doesn't report you if you went to see prostitutes or used illegal drugs; their job is to stop chains of transmission, and contact the people you were around. That's true for TB as mentioned, as well as smallpox, Ebola, etc

Anyways, since you're in Québec you might be interested in this figure, selecting the 0-49 demographic. Public health isn't telling us about this, or simple methods to reduce risk. Hell, HEPA filters are still near impossible to install in schools.

https://statistique.quebec.ca/fr/document/surmortalite-hebdo...