Idk if Fenty is big just because it’s Rihanna, though that is a part of it. Ariana grande is huge as well and REM isn’t nearly as hyped and is pretty disliked. Fenty changed the game for shade ranges, at the time 40 shades was NOT the standard, let alone at launch, and all her products have shades that work well for darker skin tones, especially very deep tones, and undertones particularly.