The problem is that it's not just your email. If you send an email to a Gmail user, Google is now building a profile on you (or was until this move) as well as your recipient. Did you give explicit consent to Google? Did you sign a EULA or SLA with them allowing this? No, they just did it anyway. Even someone who makes a point to keep themselves off of Google's radar will end up indexed and sold to the highest bidder if they send even one innocent email to a Gmail user.