The Biden administration on Wednesday took its biggest swipe yet at app stores run by Apple and Google, with a new report accusing the two tech giants of exercising “gatekeeper” power that has led to “suboptimal” levels of competition in digital markets.The Biden administration on Wednesday took its biggest swipe yet at app stores run by Apple and Google, with a new report accusing the two tech giants of exercising “gatekeeper” power that has led to “suboptimal” levels of competition in digital markets.