Pretty much. They try to link devices to a user so they can track you as your browsing swaps from one device to another, its looking at you at a user level. Google have discussed stopping this but I am not aware of them doing it.
They do this for both logged in and not users. If interested read about 'Google Signals' as this is the way they are increasingly look to track in the post-cookie future.
to stop it... not sure. Avoid Android and use anti-tracking blockers like Ghostery? Not sure how well this latter stuff works or if you just become another persons customer.
