Apple's Tim Cook grilled by judge overseeing Epic's Fortnite trial

For the past three weeks, a mix of Apple executives and experts have defended the company's policies, tightly controlling how apps work on the billion active iPhones around the world. Fortnite maker Epic Games sued Apple in August, saying its behavior stifles competition within the iPhone's world. On Friday, its CEO Tim Cook found himself answering pointed questions about competition from the person who will be deciding the case, US District Court Judge Yvonne Gonzalez Rogers.