imo it's because fridrich is too commonly used while not proving to be the best method, but not enough world class cubers use other methods.
it's like why people hate mainstream music. there are people who think it sucks, and there are others who like it (either by preference or because it's really the only music they've been exposed to and have gotten used to it).
cfop is arguably the easiest method to learn for a non-cuber (since even the most advanced blockbuilding required is 1x1x2). beginner methods, like LBL, tend to relate most to CFOP, making it the clear choice for a beginner becoming a speedcuber. it's like the music thing again because it's so easy to access the mainstream music (CFOP) but there are other genres (other methods) that a lot of people never even consider.
basically cfop is easier to pick up = becomes more popular = has more info on it = becomes super popular = better chance that a really talented cuber uses it = sets some world records = becomes more popular