I was thinking more for Artist that create assets to the game. Such as Clothing, hair styles. Some talented people might even be able to make functioning cars, Architectural design. And even provide some functionality to the stuff they make. That you could sell to other players.
It said you can design your own tshirts in a preview video i watched. If that means you can color a tshirt with inported image. compared to you bringing in outfits you make with Marvelous designer for instance that's something different.