It's been empirically proven that Google violates Gmail and other Google users privacy, so if you're concerned with your privacy, ditch Google. Google does evil, despite its tagline, and it's time the consumers ditch Google alongside Facebook and others. Google does not deserve our money, they've abused us again and again.
When Gmail was first launched, it was rolled out slowly and declared itself to be one of the most advanced - and most private - mail services available. Since then it has expanded itself into a failed social network that exists only because of Google's insidious targeted advertising, and it's getting worse by the day.