And it is a bit theoretical, as the authorities who have the capability to track your blutooth across the city have many other ways to track you (starting by calling your phone service).
What I object here with the NHS is the creation of one more tracking database with the explicit intention to let some researcher roam through it to find something interesting.
I guess my original comment is a bit vague. When I look at these protocols I am interested in how large scale adversaries (Nation State) would use this technology, but also small scale adversaries (day-to-day person you are not friendly with). I think its also important to note as others have, that being outed as having the virus does put people at risk of violence in some places.
Every person is a danger to society until this is over. Release is out of the question. The choices here are continued incarceration, or parole.
I can sort of imagine a libertarian solution here, with truth in labeling: as long as I can tell before I get within six feet of you whether you share a connected component with any conscientious objectors, then I can make my own decision about risk. But I cannot imagine that many public places would permit entry to such people.