Re: Singapore's decision was disastrous
"police in Germany collected the lists of visitors to search for witnesses to various petty crimes in the vicinity"
While it's a bit annoying, why does it matter? How is that some invasion of civil liberties? If they call you, either help or tell them to sod off.
I'm struggling to see what police could get from the app data that they couldn't get another way. This is a bit easier, and they're thick and lazy, so this is what they try.
I also can't see that something so circumstantial would be evidence of anything in court.