yeah I’ve seen this research, and again I’m in no way defending Apple’s user abuse. You say that Apple spies much more identifiers which is true as per paper but is true only while using device without touching Play services. It’s measuring spying activity only in idle/startup mode of operation. I kinda doubt Google doesn’t use WiFi MAC address of phone for social/location mining. Paper doesn’t mention anything about what kind of spying happens when you start using your phone as a typical user would: mail, web, maps, YT.