Apple and Google face new antitrust battle over Arizona app store bill

Measure would allow developers to use own payment systems as tide turns against industry that has been largely unregulated

A controversial Arizona bill that addresses the fees technology companies like Apple and Google charge app developers is raising new antitrust challenges for embattled US tech giants.

The bill - which passed the Arizona state house last week and now will move to the state's senate - would require Apple and Google to allow app developers to use their own payment systems, rather than Google's or Apple's, to process user purchases within the app.