Check the article
K-Pop Paradox: Why Some Acts Find Global Success But Face a Disconnect Back Home
K-pop's paradox: why some acts like ATEEZ and Stray Kids find global success but face a disconnect back home in Korea.
www.billboard.com
But of course, a better question is even if the international market is growing and S. Korea is the fourth largest market for Kpop,
"Why should Kpop quit Korea?"
It is not as though music needs additional investment according to market.
It is just a matter of preferences and that will vary within Korea and in every market.