Re: Decentralised
Unfortunately, there are also significant areas where there is a lot of cross-border movement for work, leisure, shopping, etc. Obvious examples are along the Irish border and the Schengen borders in mainland Europe. If these people are invisible to countries other than the one in which they live it's going to seriously degrade the information available to the countries in which they spend a lot of time, so some people may be stuck with multiple battery-draining trackers.
Of course, the jury is largely still out on whether the privacy-respecting approach will be adequate. South Korea has been very successful in containing the virus, but it has been very aggressively using all sorts of personal information such as card transactions and mobile phone data to determine exactly who has been where at any time. There is an argument that if there is only one "privacy focused" app and it fails to deliver sufficient benefits then there will be a public clamour for an immediate pivot to drastically more intrusive measures. At least if there are several attempts, and one works, other countries might have a way out that doesn't involve the South Korea or Israel approach.
Biting the hand that feeds IT
