> Google will be sent all of my browsing history No, the browser locally determines what cohort to assign you to (based on your browsing behavior, etc). Only t

> Google will be sent all of my browsing history No, the browser locally determines what cohort to assign you to (based on your browsing behavior, etc). Only the resulting cohort gets exposed to Google (or other advertisers). So they don't get your browsing history, they get the derived conclusion that you're one of X thousand people who share a certain collection of interests. (You may still be unhappy about that, but it's certainly not the same as exposing your browsing history.)