this post was submitted on 04 Apr 2024
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The reason is very simple: They rely on Google Safetynet (basically self-diagnosis). And that will immediately tell you off if it notices your device is rooted. And while you can have a lengthy discussion regarding whether this makes your phone less secure or not, this is another simple argument from Google's POV: The device has obviously been tampered with, we don't want to put any resources into covering this case. As far as we are concerned, you shouldn't use our OS like this.
So basically laziness.
SafetyNet is dead.
They rely on Play Integrity API.
That covers:
App Binary signatures App source corroboration - Was it actually installed from the Play Store? Android device attestation - Is it a genuine device powered by Google Play Services Malware detection - Google Play Protect is enabled and has not seen known malware signatures.
They can choose to ignore any number of those but they do not. It's part of their security reporting requirements to use attestation I expect.
Beyond that - a device that doesn't meet Play Integrity is more likely to be a malicious actor than it is to be a tech enthusiast with a rooted phone: One of them is far more prevalent than the other in terms of device usage.
Android apps are trivial to reverse engineer, inject code into and generally manipulate. That lets apps like ReVanced work the way they do... but that also means that blue team developers have a lot more work to do to protect app code.
Source - Android App Developer, worked on apps with high level security audits (like banking apps).