Web advertising is such a cutthroat and low margin business that having 2–3% of all browser users become untrackable is a big deal. Safari on iOS obviously has

Web advertising is such a cutthroat and low margin business that having 2–3% of all browser users become untrackable is a big deal. Safari on iOS obviously has significantly higher market share on mobile and the intelligent tracker blocking is part of iOS 11 beta.