Because they are super talented and wonderful! Aespa is a fresh breath of air to the Kpop industry in my personal opinion! The concept they are taking on is unique, and different! Not to mention their visuals are by far the best imo! Literally all of them are stunning! Giselle is an amazing rapper with a hardcore flow, karina on the other hand has a more chill and relaxed type of rapping style, which is cool! Ning Ning and winter are both powerhouse vocalists!
All in all, Aespa is a group with 4 amazing aces with the personalities to match!