https://www.polygon.com/fortnite/2018/12/6/18129089/fortnite-dance-2-milly-rock-lawsuit-epic-games

One of the most recognizable elements of Fortnite are the in-game emotes. These dances are often instantly recognizable as popular real-life dances, though some of the emotes achieve a different sort of notoriety as “Fortnite dances” — ignoring the creators who originally popularized them. Many have previously questioned Epic’s use of the real-life dances as inspiration, and rapper Terrence Ferguson, better known by his stage name 2 Milly, is doing something about it. He’s suing the company for copyright infringement, accusing Epic of appropriating his “Milly Rock” dance.

According to Ferguson’s suit, the ironically named Swipe It emote from the game — which was contained in Fortnite’s season 5 Battle Pass — is identical to his signature “Milly Rock” dance, and Epic sold it without his consent or credit.