Techincally speaking, the developer for bank don't want to risk anything.
Having the app install from Official store (Play Store/ Huawei Store/ Samsung Store), is the only best bet they can trust for security.

Usually those app that content malicious intent / trojan will get flag and not able to publish in official store. Unless it is so new, that is able to goes under radar.. "happen before".

Having developer mode is not an issue, as I'm using it to change some settings on the phone. e.g: Animation / Transition Speed.

USB Debugging Mode is the real backdoor.

In order to use USB Debugging Mode, developer mode need to be turn ON.
So to say, the developer for banking app just playing it safe below limit.

*Some banking app did flag some app installed from Samsung Store / Huawei Store.. the developer need to do better filtering, or there's no API to check that*

This post has been edited by shinichi88: Mar 3 2025, 12:01 PM