> BTS and Black pink
They would still be popular though.
YouTube hasn't even been that popular in South Korea until recently.
BTS was popular in SK way before they got big on YouTube. But their massive explosion of popularity in the west (and outside of SK in general) happened perfectly in sync with them getting big on YouTube.
The original comment was a bit miseleading, but you have to admit that there is no equivalent to Pewdiepie on Twitter.