There's a large effective difference between "do not track" as it is outlined in the bug, and how many people see it (see, for example, comment 16 in the report, and then comment 25)<p>Specifically, it's to do with <i>third party</i> cookies, not any particular site.<p>If I visit someone's website, I'm usually perfectly happy for them to record my visit and my actions. If, on the other hand, I visit their website and some invisible actor (say, an advertiser) also tracks me, then it becomes insidious, especially if that other invisible actor is active on multiple sites.<p>This gets a bit blurred when you've got large vendors with multiple presences. For example, years ago when you logged into Hotmail, you'd be briefly redirected via passport.com (then live.com), and then directed back to Hotmail. Similarly, going to Microsoft's web page, or MSN's, or Technet, or any other site in the Microsoft stable, would redirect via the same site. This gave them single-sign-on, but also allowed them to "track" your activity across the entire network. That behaviour is used by many other large organisations such as Google.<p>However, it's also made its way into other large sites like Facebook and Twitter, because sites like that have "social media buttons" appearning on sites that aren't served by those sites but are served by Facebook and Twitter, so becoming third-party objects, and doing the same sort of pervasive insidious tracking across multiple domains and web properties.<p>The thing is, Google Analytics (as mentioned in the article) is such a pervasive ubiquitous invisible actor, but it's damn useful, so lots of people want to use it. The problem is that it's a third party object, and it's of massive benefit to Google too, not just the site owner.<p>So, where "do not track" fails is in distinguishing between "tracking" that's acceptable to many people, and "tracking" that's somewhat more invisible and pervasive. Switching it all off is harmful to the internet, but until it's sold correctly, it won't be acceptable otherwise.