I thought the issue was not being able to get the app, now it's the fact that it's not open source?
I mentioned that issue in the title as well as the 3rd bullet: “Must install and execute proprietary closed-source software”.
Italy is perhaps the only country in the world forward-thinking enough to have a “public money → public code” policy. If public money finances the creation of software, the public should also benefit from access to the source code. It’s an injustice to spend public money on software then withhold the source from the public.
I really don't see why you are having so much Issues with a simple app
I said this is not a /me/ problem. It’s a community-wide social problem. It’s an unjust deployment of a public resource. Solving the problem for just one person (for myself) does just that -- it solves the problem for one person. And you can’t solve the problem for me because even if I could obtain the app without Google patronage and in a GDPR respecting way, it’s still closed-source software in the end.