Earlier quoted context omitted.
I wonder if they read your personal Gmail account to see if you're considering other offers? Or if you've corresponded with other people about their proposal?
They would be facing hefty lawsuits if they did that.
"When you upload, submit, store, send or receive content to or through our Services, you give Google (and those we work with) a worldwide license to use, host, store, reproduce, modify, create derivative works (such as those resulting from translations, adaptations or other changes we make so that your content works better with our Services), communicate, publish, publicly perform, publicly display and distribute such content. The rights you grant in this license are for the limited purpose of operating, promoting, and improving our Services, and to develop new ones."
I could easily argue that spying on your email in order to gain advantages in acquisitions or hiring could be justified for "improving [their] Services" or "to develop new ones".
[0] https://www.google.com/intl/en/policies/terms/ [1] https://static.googleusercontent.com/media/www.google.com/en...