What you need to know Day six of the Epic Games vs. Apple trial has continued with expert witness testimony from the Fortnite maker. David Evans, a University of Chicago economist, spoke about Apple's market power, the high cost of leaving iOS, and more. Day six of the Epic Games vs Apple trial has concluded with expert testimony from Epic's witness David Evans, who says Apple's ecosystem of iOS 14 and beyond has strong lock-in, high switching costs, and no restraints on its policies. Evans, a University of Chicago economist, was called to testify on behalf of Epic Games, offering the court his views on several key aspects of the case including the definition of the market, how smartphones aren't substitutes for consoles and more.