“Our automated systems analyze your content (including emails) to provide you personally relevant product features, such as customized search results, tailored advertising, and spam and malware detection. This analysis occurs as the content is sent, received, and when it is stored.”
As said, they read and analyze your mail, mainly to sell it to advertizing companies. Google make money with this.
Anyway, Gmail is a no go. From Google TOS
As said, they read and analyze your mail, mainly to sell it to advertizing companies. Google make money with this.