I don't really think the majority of fans are that loyal to any label, HYBE is just better at promoting or automaically have more eyes on everything they release
yes but Itzy debuted before corona, the big sales for GG only came during that period
i dont think its loyalty more that each of the big agencies have styles and fans that a drawn to those styles.
For example YG fans specifically like that style and it wil appeal to non kpop users often.
I myself am more drawn to SM groups especially older groups more in LSM's style.
JYP for sure has a specific style/vibe
Hybe has a core demo slightly off from YG's. Ador was the exception to that style, but they still benefited from the eyes of that monster demo.
Cube has Nothing only Idle's self production has saved them.
Starship seems to hit and miss, for example this yea IVE was a hard miss for me and soft miss for the gp.
lol i forgot to post this yesterday ....