Test 3 - Privacy from Corporate Spying - (Android 9.x; Earlier versions vary)

Exit all of your apps and reboot the phone. Once the phone is to the home screen:

Go to Settings → Apps & Notifications → see all apps → Google app info page.

Stop the app process.

Go to the app storage page.

Clear app cache and storage.

Go to the app permissions page.

Turn off all permissions listed on the permissions page.

Go back to the app info page.

Disable Google app.

Reboot the phone. Google Assistant is disabled and has no permissions to collect your data. Once the phone is to the home screen:

Go to Settings → Apps & Notifications → see all apps → Google Play services info page

Go to the app storage page.

Clear app cache and storage.

Go to the app permissions page.

Turn off all permissions listed on the permissions page.

(This app cannot be disabled)

Reboot the phone. The handset will complain that Google Play services is blind and deaf.

Go to Settings → Apps & Notifications → see all apps → Action Services info page → Notifications

Stop the app process.

Go to the app storage page.

Clear app cache and storage.

Go to the app permissions page.

Turn off all permissions listed on the permissions page.

Go back to the app info page.

Disable Action Services app.

Reboot the phone again. Google Play Services no longer has permissions to collect your data. Be advised that apps that make use of Google Play services may no longer function correctly, either.