I find the vocals of Aran and Sio as the primary reason for the song's success not convincing because streams and views were largely concentrated and remain so on "Cupid." It didn't translate well to other songs in their discography, which also heavily feature Aran's and Sio's vocals over Keena's and Saena's. It seems clear in that respect that the song itself is what's popular and not so much the components that makeup the song, further boosted by being released around Valentine's Day.
Because they didn't do jack shit to promote themselves
However it will be a different story with Ablume.