Litigation boutique Hausfeld has launched a £1.5 billion claim against Apple on behalf of around 19.6 million eligible iPhone and iPad users, it announced on Tuesday, adding to the barrage of complaints against the tech giant for the way it controls the distribution of apps.

In the most recent claim, filed in the U.K. Competition Appeal Tribunal, the tech giant is accused of using its dominant position by imposing restrictive terms on app developers and stifling efforts by other would-be distributors to offer app purchasers better value for money, reaping excessive profits.