[Cthulhu_]

The problem with many permission systems, such as this one, is that the developer of an app can't indicate to the user /why/ it needs a certain permission. Second, that the user cannot allow/disallow the permission at the time of installation, and that the app / app developer can then indicate, like in this case, that automatic two-factor authentication won't work. Which is fine.

tl;dr: Android's permission system does not allow for transparency from the developers. It makes the app developers look like douchebags going 'I WANT TO READ ALL YOUR TEXTS', instead of a 'I'd like to make things a little easier for you by automatically intercepting two-factor authentication texts'.

[jaxb]

You're proposing to solve a non-tech issue (trusting the app's developer) with tech -- what's to stop the developer to lie anyway?