My bank does let me use such a device. In fact all big banks I use (and I use about a half dozen) work just fine on GrapheneOS.

> If I want to participate it modern life, where I live, I need an Android (Google blessed) or Apple device.

"Modern life..." - wow. The only thing I'm not doing that you are is tap to pay with your phone. I have cards that work just fine for this use case. Stone age, right? Not sure if anyone could survive in a modern society without it. o_O