Swiss company Proton today filed an antitrust lawsuit against Apple, accusing Apple of violating U.S. antitrust law. Proton is technically joining

Apple is facing fresh legal heat from privacy company Proton, which wants to break open the iPhone's closed App Store.

We are seeking to permanently end anti-competitive behavior on the App Store, and we are joining this lawsuit to ensure that any future settlement enforces real changes to Apple’s practices and policies to benefit all consumers,