What about fingerprinting?
Discussion
Google does not necessarly need submitted user data for tracking. They are pretty good at working with your meta data.
Can be done with such libraries sure, but it can also be done from the backend server.
Just because some tracking libraries are onboard doesn’t mean that you are tracking as individual.
The other case is also possible. Just because there is no tracking library doesn’t man the app isn’t tracking you.
Most companies are using thirds party libraries because it’s much cheaper to use and much more convenient.