”We experimented with a peer-to-peer model for source quality. Then, we adjusted source quality to a maximum of 720p. While we have lowered costs from these efforts, our network fees in Korea are still 10 times more expensive than in most other countries”

https://techcrunch.com/2023/12/05/twitch-to-shut-down-in-korea-over-prohibitively-expensive-network-fees/