ico That is already the case in Denmark. The MitID app that is essential for everything (it is the government authentication solution) refuses to work in GOS. Without it you can't use any government website, read any digital post, use your card online, nor do any banking, you can't even call the bank to speak to them because you need to authenticate via the app in the process.
At least they offer a dongle. In the other hand Sweden has a similar setup and it is only via app. The moment they turn this on you will be a de facto non-citizen unless you use a blessed phone.
There is no "option" to choose. Usage of some apps are de facto mandatory.
I really wish EU will step in and stop this madness. But I suspect that when they decide to act, it will be too late already.