In India they released an app as soon as the lockdown started ( maybe in April 2020 ) called ArogyaSetu app which did exactly this . We could see if there were any COVID positive person nearby through the app but the downside was as you mentioned breach of privacy + people didn't know they have to turn on their bluetooth to make it work lol.
Ha, that defeats the purpose of it rather quickly.
Exactly . Just like wearing the mask like this -
Image Source
What's the point in it ? I see many people telling , Oh I have Arogya Setu app I am safe but do you even know how to use it?