An antitrust lawsuit filed in San Francisco federal court accuses Google of shutting out rival Android app stores by monopolizing app distribution ?and billing, in violation of U.S. antitrust law. Aptoide, a Portuguese company that bills itself as “the alternative Android app store,” ?and has about 436,000 apps in its catalog and more than 200 million ?annual users by 2024, said it would have exerted substantially more pressure on Google’s pricing and policies ?but for the tech giant’s “anticompetitive chokehold” that shuts out smaller rivals.