both BP and BM receive a huge and massive response for their debut due to being a YG girl group.. but why YG girl group?
because of the impact that 2NE1 left during their career, they got the whole kpop community and even gp tuned to their music .
you dont see the same amount of buzz & hype for other gg debuted on big 4 (i mean theyre hyped but not as HYPED as bp & bm).
2ne1 is being the main catalyst of people checking up to the other YG girlgroup during their debut day because 2ne1 is THAT impactful
(note that this is only for initial hype & reaction and no correlation with the further chart performances etc. BP manage to become the biggest girl group due to their own factor but the initial catalyst where people checking them up during debut is due to being 2ne1 little sister)