Google's privacy settings cannot be trusted.
They're settling a lawsuit over allegations of misleading users, secretly recording their movements even after location tracking had been turned off, and offering that data to marketers to sell advertisements.
npr.org
Google pays nearly $392 million to settle sweeping location-tracking case
"Google has prioritized profit over their users' privacy," said Attorney General Ellen Rosenblum of Oregon, one of 40 states to bring the case. "They have been crafty and deceptive."