Chrome sends every address that you enter into your address bar to google. I noticed this when I decided to look through my google history and it contained all my duck duck go searches. That was enough to put me off of it.
You might want to disable web history in google account settings. Its not a worrisome thing though, you're using an account, so syncing those is obvious.
The reason I was using duck duck go in those days was because I didn't want google knowing everything I searched for. It's caught up now, but it was a bit worse search in those days.
