> Something similar was addressed some years ago as a feature request for GrapheneOS https://github.com/GrapheneOS/os-issue-tracker/issues/284. To summarise there was no way to do this without an unacceptable security cost to the OS, but this is sort of doable if you run your own userdebug build which you have the power to do.

It's badness enumeration which is an unworkable approach to providing strong privacy. It fundamentally can't provide it, only weak case-by-case improvements which are very fragile and trivially bypassed. It can also be done by modifying APKs instead of having a hooking framework within the OS heavily compromising security. You don't need the OS providing anything to use arbitrarily modified APKs. We also don't want to give apps a legitimate reason to ban GrapheneOS as opposed to being able to convince the tiny number of apps enforcing Google certification to allow it.