I know with google apps you don't get served ads ... but nevertheless, doesn't part of google's business model still depend on them mining the content of your e

I know with google apps you don't get served ads ... but nevertheless, doesn't part of google's business model still depend on them mining the content of your emails? Or to put it another way: does google guarantee that with google apps email, none of your content (or contact info) is used for any purpose other than just spam detection?