It'll be great at first. Every transaction everywhere will be allowed, and it'll be just the most convenient thing ever. People won't have to do taxes every year, because they'll be done transparently in real time. There will be great support for people who lose their phones or whatever (it will be contracted and ChatGPT-based, not employees of any government).
But then people will start to have transactions be declined...Only a few prominent people at first, and only the most extreme of thought criminals, but slowly, gradually...It will morph into the weapon of ultimate control over individuals from a faceless machine.