CNNMoney: Many fans of this television season’s biggest breakout hit, “Empire,” likely watched Wednesday’s finale “live,” at the very moment it premiered on Fox. But “Empire” didn’t start out that way. Much of the credit for the show’s success must be given to on-demand TV options that barely existed a few years ago. There are half a dozen ways to watch “Empire,” and all of them have contributed to its total audience of 20 million a week.