To add to that second point, stock android is tied to google still. last I checked, it would phone home on internet connectivity check, I think hal but I could

To add to that second point, stock android is tied to google still. last I checked, it would phone home on internet connectivity check, I think hal but I could be wrong, and a few more. But, if you use grapheneos, they replace the google services with their own alternatives and sometimes let you disable the feature entirely. Also, on any rooted android. You can use AFwall+ to firewall any google connection or app. This way, even system services can't make network requests.