Line Webtoon is a South Korean company run by a conservative government. In that sense it is pretty easy to see why they cater to "K-Drama" style and anything but mature themes that goes past the "holding hands / innocent flat lip-smack-kiss-scenes" The only way you will get away with a mature themed comic as a webtoon artist in Korea (especially sex related NSFW) is by hosting it on your own website or jump onto Lezhin where nothing gets censored.
There is a misconception about Line webtoon where ppl think that it is an american company - but the english version of the website is nothing but a branch targeted towards comic artists in the west (also called a business expansion) and the HQ is still set in South Korea.
Several artists had to go for an interview at the Korean HQ back just a few years ago when they signed a contract.
So, speaking from personal experience, there is nothing weird about LW taking down content that does not stay within a conservative mindset as an overall concept. They won't take down stuff based on a few swear words that are crossed out or a few scenes that has been slightly NSFW but still censored.
Korea is just a very tough business to deal with. but it is still a lot easier to deal with compared to IOS's restrictions on NSFW in general lol