Timely reminder for everyone that there is as of yet no evidence that Apple/Google/DP3T/ExposureFramework based apps deployed in the wild actually work effectively. They've been deployed in a number of countries but there is currently insufficient available data to show that they actually work.
(of course we also know that limited disclosure apps not based on this framework developed in Australia, the UK, and France definitely don't work because of bluetooth issues)
One of the best use cases for apps like this is public transport, except that it doesn't seem to work on buses. Hopefully it works better on trains but given the similarly complex metal environment, I wouldn't hold out much hope.)
It partially works as in it gives people who live in a technological society (like ours) the illusion and hope that technology can solve problems that don't have immediate technology-related solutions (if at all).
Tracker apps are partially what the massive TSA-implementation programme was in the States post 9/11, i.e. security theater combined with the illusion that the dominant paradigm of that time (force/projecting power in the early 2000s, technology in our present times) is a silver bullet.
(of course we also know that limited disclosure apps not based on this framework developed in Australia, the UK, and France definitely don't work because of bluetooth issues)
(edited to add
See this paper out of Ireland: https://www.scss.tcd.ie/Doug.Leith/pubs/bus.pdf
One of the best use cases for apps like this is public transport, except that it doesn't seem to work on buses. Hopefully it works better on trains but given the similarly complex metal environment, I wouldn't hold out much hope.)