This url shocked me.
They apparently track every app I open and use on my Pixel phone. They had individual entries for when I skip a song in Google Music. I feel physically sick. I went through and deleted most of what I could and turned off tracking where I could.
Understanding how Google Music works and knowing that Google tracks information about you does not necessarily imply the very real understanding that viewing pages like this provide. People generally don't logic that way, us included.
Under the "Chrome, Google Analytics, and more" I see "Used com.kongregate.mobile.adventurecommunist", which is a game installed on my iPhone. Ok, I also have my Gmail logged in there as well, so they somehow read shared data or whatever. But I also see "Used es.socialpoint.chefparadise" which is a game, installed on my iPad at home which is mostly used by my wife for random games and stuff and I don't have any Google account logged in there.
Most iOS apps use various embedded trackers, just like websites.