A former UK competition official has filed a $2.7 billion lawsuit against Apple on behalf of app developers, alleging its App Tracking Transparency rules unfairly disadvantaged third-party apps while favoring Apple's own advertising ecosystem. Engadget reports: ATT debuted in 2021, ostensibly to give users more control over how much of their activity app developers can track across other apps and websites. The company told Reuters it was "bound by the exact same requirements as all developers."

However, regulators across Europe including in France, Italy and Poland have investigated ATT. Germany's competition regulator, the Federal Cartel Office, last month determined that Apple was favori...