The OS could lie to the app after permission for some aspect was revoked and respond with no data or garbage data. For example if you revoked permission for ac

The OS could lie to the app after permission for some aspect was revoked and respond with no data or garbage data. For example if you revoked permission for access to pictures or something else like music, when that app queried for the number of pictures/music on the device the OS would just return 0. For something like GPS you could return a valid location (like say somewhere on the Google Campus).