> I will not bank with HSBC because their app will not work if you install things from outside the Google App store

I have this requirement too, since I like to use F-Droid.

My point isn't that there are no such users. My point is that product managers in banks don't care about F-Droid users, since there's so few of us that it's not worth them worrying about.

Many websites are giving up Firefox support, and Firefox adoption is much higher than F-Droid.

If a bank app happens to be okay with F-Droid, it's not because they look out for the needs of F-Droid, it's simply by happenstance.