Turning off the WiFi doesn't do anything, Android phones stockpile location-based telemetry while in airplane mode and upload it once you reconnect to the internet[1].

I can't speak for everyone here, but not all of us use stock ROMs and Google Play Services. I personally use GrapheneOS, which let's you significantly neuter Google's spyware capabilities.

[1] https://digitalcontentnext.org/wp-content/uploads/2018/08/DC...