https://www.reuters.com/article/us-apple-epic-games-lawsuit-analysis/in-lawsuit-fortnite-maker-to-test-idea-of-iphone-as-market-unto-itself-idUSKCN25B02M

'Fortnite' maker Epic Games has launched the most significant effort yet to advance the legal theory that Apple's iPhone ecosystem has become so "sticky" that it is a distinct software market over which Apple exercises monopoly power.