Google Ads manager account (MCC) hacks your Chrome browser and shares your personal data

Suddenly i realized a funny bug/feature of current stable Chrome 69.0.3497.100 (Official Build) (64-bit) and Google Ads manager account:

1. If there are some people logging into one after one from own Chrome into MCC,
2. If syncing of personal data in their Chrome is ON,
3. If no one of them has a syncing passphrase...

then:

the user, who currently logs in into MCC, gets all personal data (bookmarks, passwords - yes, passwords!) into the own Chrome of the user, who was logged in into MCC previously.