The app for Ontario is made by Shopify... same guys who do our legal cannabis store.
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Blackberry? I didn't know they still existed.
As someone pointed out, the tech already exists to de-anonymize cell phone data publicly available. It is an open secret you can be easily tracked.
All it really takes is following a particular anonymity phone and see where it calls home. If your phone is at 123 smokey way every night, they can now see who lives there. Add where you go to work, and they can narrow it down pretty easily if multiple people live there. Then they have you, all with public anonymity data.
These apps are meant to notify you if you have been near someone who has the illness beyond a certain amount of time. Then you can self isolate and get tested.
Presumably the double bubbas won't opt in. But if enough normal people do, it could help slow spread. Its like contact tracing. Mostly voluntary but not perfect.
As a rule, I keep location services off. For the apps I allow it, I only allow it while using the app.
So if I went to a work site, meeting, or traveled on a public system like a plane, I might turn it on. Normal personal movement, no.
There is a middle ground.