Living in Fortnite is the only way out of its multiverse.
There’s no reason why Fortnite can’t feature something or someone if it exists. In terms of likelihood, I’d rate Will Smith’s new appearance in Fortnite on the “likely” end of the scale, because it’s not as weird as, say, Martin Luther King’s ‘I have a dream’ speech airing in the whimsical promotional vehicle-slash-videogame about murdering other players. A dataminer discovered the skin last month.
It’s not a Will Smith skin, it’s actually a skin from Mike Lowery of Bad Boys. It can be purchased in Fortnite’s Item Shop. It includes the Detective’s Duffle Back Bling as well as a dual-wielding pickaxe called The Loose Cannon Cutters. It’s likely that there are rich lore reasons for its name.