You are right, they have the most important banking apps for my home country. However, I wonder if you still have to install them via google play store API, like in /e/OS?

Edit: yepp, it is installed via google API and require spoofing the google certificate. This is as they write not a sustainable long term solution, as this could break at any time. Graphene themselves say that the only solution long term is to get governments to develop apps for graphene diectly.