The first problem here is using Google to find information about Kpop rather than Naver. Many of the abusive practices in Kpop also happen in the western music industry. It doesn't make it right, but Americans and American media have a massive blind-spot when looking at foreign cultures.
These videos explain a few of these
https://www.youtube.com/watch?v=bn0gmu_m-os
https://www.youtube.com/watch?v=vxj9rogBPi0
Kpop has become popular because it fills a niche that the western music industry doesn't cater to anymore. Some of it is actually better than the American pop scene. Right now there's no male western pop act with this Kpop idol's level of skill.
https://www.youtube.com/watch?v=fEKVyfsYnuM
Comparing similar acts shows why Kpop is becoming popular.
Kpop
https://www.youtube.com/watch?v=xkwYeEMpTIM
western pop
https://www.youtube.com/watch?v=Fe6D899cz3c
Every fan of a Kpop artist has a long list of how they have been mistreated and mismanaged, and sometimes these aren't even justified, the fans are being oversensitive. The fans pay for protest trucks to park outside the music company buildings with screens displaying their demands for better treatment.