The U.S. Supreme Court ruled 5-4 against Apple to allow customers to sue the company for allegedly driving up prices with monopolistic practices.
The Court upheld the Ninth Circuit Court of Appeals' decision in Apple v. Pepper, suggesting that App Store customers are buying directly from Apple, and that Apple isn't just a go-between for customers and developers. Specifically, it allows for suits from iPhone owners who believe that Apple's 30% sales commissions could be driving up app prices, especially as there is no other lawful way to get apps on iOS.
“Apple’s line-drawing does not make a lot of sense, other than as a way to gerrymander Apple out of this and similar lawsuits,” Justice Brett Kavanaugh wrote in the majority opinion. The arguments in full can be found here.