If we're imagining worst-case scenarios, my first thought is "use track info to discover unlicensed music usage". Or for ads.
If we're imagining worst-case scenarios, my first thought is "use track info to discover unlicensed music usage". Or for ads.
What Google most likely does however is use persistent analytics IDs to track people and improve their on-site tracking. Let's say you clear your cookies and happen to change IPs (dynamic IP, etc) so you appear to Google's web properties as a new user - all they have to do is wait for some other piece of software on your machine to report analytics with a persistent ID and essentially bridge the gap between your old identity and your new one, so now just based on IP alone, Google's web properties can infer with good accuracy (and the more datapoints the higher it goes) that it's you.
#DONOTWANT