There is no way whatsoever that you&#x27;re getting my name or email address by some third party serving your ad to me, unless I happen to end up voluntarily filling those details in on your web property. Which I probably won&#x27;t do, unless you have something I actually want, and I trust you. That&#x27;s the difference. That and the fact that if you publish your &quot;the small fraction of people on $EMBARRASSINGTHIRDPARTYSERVICE&#x27;s mailing list which clicked through to my landing page and filled out my webform&quot; list without me having opted to allow you to share the information you&#x27;ll find yourself in a courtroom.