Mobile Ad Blockers Have Already Become the App Store's Top Downloads Global marketers wary of the fast-growing trend COLOGNE, Germany—Apple's support of ad-blocking in its iOS9 software has caused plenty of hand-wringing for U.S. publishers and ad-tech companies, and it appears they had good reason to worry. As of today, three of the Apple App Store's top paid apps in the U.S. are ad blockers, inc