I really want to leave the Google and Apple Ecosystems, but I still need "these" Banking Apps. Some Banks don't even offer a Web based experience anymore.
While Sparkasse and Volksbank in Germany aren't the most ideal banks cost- and interest-wise, they do still offer transaction authentication via debit card, without the need for any smartphone.
But do you need "these" banking apps with you 24/7?
An old smartphone or tablet can do that job and stay in a drawer at home 99% of the time.
Why doesn't the EU force these banks to support all platforms including web?
I mean, if they can force Microsoft to support other browsers than IE6, then why can't they force banks?
Get a new bank, make sure your old one knows why you left. Try a local credit union.