Kenshi Yonezu's Chainsaw Man OP Kick Back is currently #8 on Youtube chart Korea and #14 on Spotify chart Korea. But it is nowhere to be found on any Korean streaming platform. There is no other explanation for this than Korean charts purposely supressing Japanese songs.
And tbh it wouldn't be unprecendent. Korea is know for actively supressing Japanese pop culture in 80s and 90s until they grew their own.