The top 3rd gen girl groups are still doing great, no bg except for BTS comes close to BP's numbers, TWICE are doing great on it, Red Velvet just peaked at over 8M MLs.
(G)I-dle and Aespa are doing as great Itzy, with Aespa's songs having the same stream numbers as Itzy's latest songs, and (G)I-dle also surpassing the 6M MLs.
So no, it's not just ITZY and IVE. A lot of girl groups are doing fine on Spotify.
The conversation is about 4th gen groups so you bringing up 3rd gen ones is completely meaningless here.
How many of the groups you mentioned have high streams of their bsides too? The only ones who have a good ratio are itzy. The others just have 1-2 title tracks with huge streams while bsides are struggling to hit 10M. That's not what you call success on Spotify
