I created a google takeout and in that zip file I found some files containing a ton of data about me. It has logged every single page I visited while using the google search engine and chrome browser. It even logged every single time I opened an app on my old android phone. It even has VOICE RECORDINGS of me and a log of every time I used google assistant. This is just some of the data and I’m very sure there is even more data they have.
Oh sorry, my bad. I meant it’s not some third party app that has to be installed with root privileges, but rather just a well integrated part of the system, which uses Android’s permission system to deny internet access.