I'm pretty sure a sizeable number of non-EU based sites added cookie popups as well. Cookie popups were stupid - cookies aren't really an opt-in system. DNT sh

I'm pretty sure a sizeable number of non-EU based sites added cookie popups as well. Cookie popups were stupid - cookies aren't really an opt-in system. DNT should have been an opt-out system for off-site tracking. If Facebook tracks you through a like button or Google tracks you through an ad/analytics after you sent then a DNT header, they get into trouble. Maybe the header size effect DNT could have been mitigated by not sending it to sites with the same origin as the current page (or another origin policy that the website specifies).