Its just for show. Ever seen the ones that uses clear(plexiglass?) rims?
Kinda cool for show because its see-throuhg but cleaning would be a bch. But looks really nice om high-end cars with BBK.
It looks too weak literally, although cf material can go stronger than titanium structural integrity is still in question.
But some F1 cars uses pure solid cf in the center, the part that holds the outer rim.