Apple explains Safari block targeting email-based identity services for cross-site ad targeting
TLDR
Apple confirmed it is blocking email-based identity services like LiveRamp and ID5 in Safari to prevent cross-site ad targeting without explicit consent.
Optimixed Overview
Optimixed's original report on this story.
Apple's Safari engineering team published a blog post explaining the browser's block of email-based identity-tracking services, confirming that companies converting email addresses into cross-site advertising IDs—such as LiveRamp, ID5, and The Trade Desk's UID 2.0—can no longer communicate with Safari. The block applies to Safari on iPhones, iPads, Macs, and Vision Pro, disabling the ability to recognize and target users across websites without cookie-based tracking.