Earlier quoted context omitted.
> So I’m guessing with this you’d use an alternative store like F-Droid instead of the Play Store? Not necessarily, but that's the best way to do it. Between apps from F-Droid and a browser, you don't need any apps from the play store. Your bank doesn't have an app on F-Droid you might say? Well that's what the browser is for.
Ha. Your example is rather specific seeming to me, as I actually work on one of the big 5 Canadian banking iOS apps here in Toronto. For obvious reasons; we don’t ship to alternate stores - even if such a thing as iOS sideloading existed; we wouldn’t support it, and we of course do not support anything but the Play Store on Android. It’s obviously partly a support cost issue - there would be less than 1% of our milli…
Your uncertainty about this suggests it's not something you decided, but please let anyone involved in making decisions like that know that's a dick move. It's the user's device, not the bank's.