Earthyyy And that is exactly what I meant. And they sell info to government agencies. Think law enforcement and geofence warrants. Most of the tech we have today came from, in large part, government agencies. Tor (Navy), Maps (Air Force, NASA) and so forth. We won't even go into what it means when members of Congress have dinner with the CEOs of these companies. So for the OP here, what's the point of fingerprinting multiple Google accounts? Obfuscation and compartmentalization should be part of a larger strategy of hiding in the shadows from some of this nonsense. I look at the aforementioned companies as police knocking at the door of my internet connection without a warrant. The role of these companies is to provide you with wonderful easy convenient services while providing a back door to anyone who sees value in your data to come and get it.
Put locks on you internet doors and behave accordingly. It's daunting but well worth it. Good luck all!