I believe it refers to the addition in iOS 14 where users have to explicitly opt-in to being tracked by advertisers. The ad industry is expecting most users to

I believe it refers to the addition in iOS 14 where users have to explicitly opt-in to being tracked by advertisers. The ad industry is expecting most users to decline to be tracked, hence limiting the usefulness of targeted ads. Source: https://techcrunch.com/2020/06/22/apple-ios-14-ad-tracking/ https://techcrunch.com/2020/06/22/apple-ios-14-ad-tracking/