why is webtoon saying this when it's obvious it's pretty much impossible for any of us to check copyright issues with the original creator.
if I wanna do a sailor moon fanfiction comics how do i get ahold of Naoko Takeuchi? or the american company who has the right in the US?
I bet Webtoon don't care, if they like you're comic they let you through and if they don't, they won't let you get the pledge by inventing excuses as many other people have more views so they let these get the pledge first... So far it's how they dealt with things regarding other issues.