Google had previously cleared the air by saying that syncing was not automatic and not enabled by default, and that users had to take extra steps if they wanted to sync. However the hullabaloo also highlighted the confusion and misunderstandings that users might have, which is why with Chrome 70, Google has announced that users will be able to disable the linking of web-based logins with browser logins.
Hi all, I want to share more info about recent changes to Chrome sign-in. Chrome desktop now tells you that you're "signed in" whenever you're signed in to a Google website. This does NOT mean that Chrome is automatically sending your browsing history to your Google account! 1/
— Adrienne Porter Felt (@__apf__) September 24, 2018
According to Google, “While we think sign-in consistency will help many of our users, we’re adding a control that allows users to turn off linking web-based sign-in with browser-based sign-in—that way users have more control over their experience. For users that disable this feature, signing into a Google website will not sign them into Chrome.”
Google adds, “We deeply appreciate all of the passionate users who have engaged with us on this. Chrome is a diverse, worldwide community, and we’re lucky to have users who care as much as you do. Keep the feedback coming.” Chrome 70 is expected to be released mid-October so keep an eye out for the update if this is something you’d prefer.