Maybe it's changed since it's been a long time since I blocked all that stuff entirely, but I thought the idea was that websites collected a bunch of data about you, your browser, and your activities (using JS) which all gets sent back to google. Google processes that data and delivers analytics reporting back to the website owners. If google were also using the data they collected to generate a device fingerprint to compare against data collected and reported at other sites you would never know. That'd be in addition to them logging the sites you visited and when as well as your IP address and user agent which they get just by remotely hosting those scripts.