No they haven't. Fortnight has an ingane currency and someone just launched a crypto with the same name that is not affiliated to epic games. This is a scam trying to pretend it's a somewhat legitimate coin, if you still believe in these.
I know that the coin in that link isn't officially affiliated with Fortnite. But do the 6000 10year old holders know that????
seems a bit sus that this multi billion dollar company added a "crypto" to their game, considering their player base is so young I wonder how many kids have lost money on this