Android does not collect any telemetry, GApps does. Pure Android as developed by the AOSP is fully free and open-source software and does not communicate with any vendor’s services, which is why there are completely private Android distributions like LineageOS or e/OS. Android is NOT Google, it is developed and maintained by the Open Handset Alliance. That most people happen to run modified versions of it like Samsung’s Android flavour or that they happen to have GApps like Google Play Services installed is the actual problem.