The Korean government / ISPs justification for (effectively) removing net neutrality is that services such as Netflix/Twitch put an undue strain on the internet infrastructure that shouldn’t be borne by every user.
Of course while Netflix can raise prices to cover those fees, Twitch is free, so it can’t do the same.
I can see both sides of the argument here, but it is strange to me that the cost does not fall on consumers instead of the producers—the U.S. has had bandwidth caps for users for a several years.