Google literally has remote control over all pixel devices and can push arbitrary code via the play services at any time without user approval.

In this day and age, if you don't trust your phone vendor with your data, you shouldn't be using it. They can do anything at any time and you wouldn't know. Even if there is no tracking code on your phone at this moment, they can put it on at any time.

Can't find the news article anymore but there was an incident where Google accidentally turned on airplane mode for every pixel at once via their remote control tools.