Hailey Bieber got a billion dollars for a hole in a phone case. That's barely an exaggeration. Rhode launched in 2022 selling lip balm and moisturizer, the two most crowded categories on earth. Three years later e.l.f. paid $1 billion for it. The thing that separated Rhode from a thousand other celebrity brands was a silicone phone case from 2024 with a pocket molded into the back that holds its $18 lip tint. Then a carabiner that clips the blush to your bag. Now the same pocket is molded…