if you install the play store and give it perms to install apps Google can see all apps across all profiles anyway. Fact check this but I believe this is the case.

If you install play services it makes sense to benifit from the play store's security with a burner account and if an app is removed or censored use another method to obtain said app.

I can only see the benefit from a main profile and a kids profile. Or just have a main and run FOSS only if that's achieveable for your needs.

#GrapheneOS

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What you're saying about play services might be true if you install it on the primary profile, but not a subprofile - otherwise what does ”sandboxing” even mean?

The Play Services being sandboxed means they are placed in the same sandboxes that other user installed apps would have. What the apps see entirely depends on what you allow via the permission controls. If you are concerned about app communication then use a user profile to separate.

The sandboxed Google Play apps cannot see installed apps by themselves, but, if you are using Play Store to get them then it is likely they'd get an idea. If an independent app includes Google connections or services within them then that is a separate matter. Some also work without it, Firebase Ads and Analytics is an example of a library that works without Google Play services.