The latest version of Google's Chrome browser will now automatically log users in if they log into any Google service. This, in turn, opens the door for the user's browsing data to be accessed by Google. While this isn't the case now (Chrome's sync features aren't turned on by default), it raises several red flags as to the future of the privacy of user's browsing data.
https://www.notebookcheck.net/Chrome-now-automatically-logs-you-into-the-browser-without-telling-you.334552.0.html