“App developers have historically used IDFA to help target users with ads and track the performance of ads across different devices. The iPhone maker will require app developers from early next year to show a warning label to users before collecting IDFA info on iOS 14, and will also require that users opt in to sharing it. Those changes have triggered an antitrust complaint from French advertisers who say it could make their revenue plummet.”
Source : Apple (AAPL) Targeted by Privacy Campaigner Who Took on Facebook – Bloomberg