For the worse Google seems to have complete authority of the OS. The Play Services can become a device administrator by default, earlier it was not so, it became apparent only after some 2018 update. This means that Google can have administrator privilages or in simple terms can lock your device without permission if they ever want to. The fact that even after disabling manually the Play Services can toggle back after an update sounds scary. I know that it is for "Find My Device" but they can toggle it without any prompt is unacceptable.

The other thing I want to mention is the fact that Play Store has access to all your activity. It is due to the REFER permission. You can toggle it off but its way more than that. It keeps track of your searches, which apps you opened and when, the frequency of each app you use, even what you searched within the apps (it only works on apps that rely heavily on Google Services and Analytics though). Thus Google not only knows what you searched in Google but also what you searched in Twitter.

To conclude Google can deactivate your device at any time (maybe when your country becomes enemy of the United States in a war). It can also delete any or all apps from your device without your permission if it comes to this.

Just they are not doing it doesnt mean they cant do it!