This trend started in China, spread to countries like mine, and (as recent history shows) the relatively free democracies have been more than happy to copy some pretty nasty ideas from autocracies like ours — we went through your current news cycle 10-15 years ago, so I wouldn't be surprised if removing the last few vestiges of having control over your computing also came to you in another five to ten years.
Part of the story is that it only takes a /single/ major scandal RE sideloading to seriously injure a bank's reputation, even if the vast majority of sideloading use cases are legitimate.
I’m very much a credit card point churner and I have an HYSA. The same rates and offers are on the websites and the apps.
And how would a bank know if you’re using a website on a rooted phone?
People are complaining about the app stores when they are choosing banks which are app only - which I would never do - you should be complaining about your bank.