If we shoot this down and every bank requires me to download a mobile app, then fine. What this is proposing is basically to turn websites into mobile apps: device controlled, unmodifiable, broken on any non-approved hardware. If that's going to be the case regardless, I'd rather just download the app, at least that would be more honest about what's actually going on, and at least I'd still be able to use my adblocker when I browse the web.