I just did a Google search and saw a new ad format. I've never seen anything like this before (details whited out to make it anonymous): [i.imgur.com...]
Its an ad that has my email address pre-populated into a form field that I can submit to get information about a product sent directly to me. When I click on the "privacy" link in the ad, Google tells me: "When you submit this form, your email address will be sent to the advertiser."
Umm... No thanks Google. Is there an opt-out for this?
It'll pre-populate if you're logged into a Google account. I use these all the time (AdWords for my clients) but I had to write and get permission; not sure if it's rolled out everywhere yet. But we've been doing for newsletter signups for about a year.
You don't need to opt out; nothing gets sent unless you click the submit button (Get Offers) on the ad.