An interesting new study of 1,759 iOS apps before and after Apple implemented a major privacy feature last year which required developers to ask permission to track app users — aka App Tracking Transparency (ATT) — has found the measure has made tracking more difficult by preventing the collection of the Identifier for Advertisers (IDFA), which can be used for cross-app user tracking.
However the researchers found little change to tracking libraries baked into apps and also saw many apps still collecting tracking data despite the user having asked the apps not to be tracked.
Additionally, they found evidence of app makers engaging in privacy-hostile fingerprinting of users, through the use of server-side code, in a bid …
