Trackable Ads Earn 2.7x Higher eCPM Than Non-Trackable Ads: Pubmatic Report

When Apple started to enforce its Application Tracking Transparency (ATT) rules for iPhone in April 2021, no one knew how many users would share their IDFA device ID when given an explicit choice.  More than one year later, Pubmatic reports the rate is about 30% for iOS 14.5 and higher, compared with 55% for earlier iOS versions.  One secondary result is that impressions with IDFA present earn a cost per thousand (eCPM) that’s 2.7x higher than impressions without an IDFA.