New Delhi, Sept. 3 -- Apple faces a £2 billion ($2.7 billion) lawsuit brought by UK app developers who accused Thursday the US tech giant of giving its own advertising services an unfair advantage by imposing tougher privacy rules on third parties.

The claim, filed with the Competition Appeal Tribunal by law firm Hausfeld, centres on Apple's App Tracking Transparency (ATT) system, which has also come under scrutiny in several European countries.

The feature, introduced by Apple in 2021, requires apps to obtain user consent through a pop-up window before tracking their activity across other apps and websites.

If they decline, the app loses access to information on that user which enables targeted ads.

The claimants argue that the ...