I see how this would be considered a problem in the US.
In Europe we see these things differently. I have a number of apps already, that knows my government id. Honestly I don't know how many, I haven't needed to keep track.
All sorts of apps from drivers license to a social networking app, which all needs to know my exact id to work. Even my kids has their government id on their phones. This includes an app which only purpose is to prove the users identity.
Having one more appwith your id is not a problem. Specially when its purpos is to NOT show your id.