Mind you, it is not simply about entertainment. We literally have entire industries that has been monopolized by chaebols. Hyundai was allowed to buy Kia, the only competitor after it went bankrupt. And now Hyundai has an effective monopoly (more than 90%) on all car sales in the country.
And recently Hyundai also tried to monopolise the ship building industry by merging with Daewoo. And it was approved in Korea but thankfully EU and Japan blocked it because they did have a say in it.
SM is one of the companies that played enormous role in hallyu. Allowing Kakao and Hybe just do whatever is pretty screwed up.