hemingway I ran into this app while auditing app permissions and had to wonder about the security implications of providing the app undeniable access to everything.
The "auditing app permissions" approach, for system apps, is probably unproductive. A vast amount of code that ships with GrapheneOS, and that runs with elevated privileges, is not "app" code. Meanwhile, the interactions between various system apps can be non-obvious, so denying permissions to them frequently leads to mysterious failures, perhaps weeks or months after the permissions were removed.
Based on a quick glance, the code in question appears to be related to capturing data when a user wishes to submit a bug report. If that is correct, such an app would plausibly need access to various data in order to collect it for inclusion in the bug report.
To assess the "security implications" of that code it would be necessary to inspect the code.
hemingway The fact that it is related to adb and has these permissions makes disallowing restricting its permissions until the user deems its use necessary seems like a security blunder.
If it is believed that shipping the Shell app with those permissions represents a "security blunder" by the GrapheneOS team, presumably it is feasible to provide a proof-of-concept, or at least a plausible description of a specific problem such as privilege escalation, presumably via responsible disclosure (the GrapheneOS project provides a security.txt).