Dance is culture, obviously. It reflects something about people who created and practice it.
This is the obvious point that loads of folks here seem to be missing. As for giving credit to works that may already be derivative, allow me to introduce you to most writing, art, music, and other creations. It's about re-use with transformation. What you need to do, as a creator, is give credit to where you got the ideas that you're transforming.
So sure, Epic can claim that they've transformed a lot of the dances used in Fortnite. They animate them, put them in a video game context, all of that is transformative. But it's disingenuous in the extreme to say that they were not, at a minimum, inspired by previous artists. Many of whom are people of color. At a minimum, Epic needs to credit those from whom they've derived their moves.
It's definitely the academic in me, but we'd have less fuckery all around if people were honest and upfront about their fucking sources.