Netflix executives identified an unlikely competitor in its fight to lure new viewers to its streaming platform when it reported fourth-quarter earnings on Thursday.

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The streaming giant said it earns an estimated 10 percent of all television screen time among U.S. consumers, or about 100 million hours per day out of a possible 1 billion hours. Based on that metric, Fortnite, the immensely popular video game created by Epic Games, is a tougher challenge than traditional media competitors, Netflix executives said in a shareholder letter.

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