I don't really care about the industry and how the business works. You're completely missing the point here and actively trying to create an issue that isn't a problem yet. Meanwhile,instead of perhaps seeking answers from LINE the way I have, I feel most people here are complaining for no other reason than to just complain.
I know this is going to sound really mean, but if people are this worried but not doing anything about it, If you're not trying to get in contact with LINE to make sure this won't become an issue. Than sorry to say, who cares? If you and the rest won't actively make sure LINE will support its fellow creators, than why should LINE care about any of you?
Also, Youtube's system works far differently than what's being currently used by LINE. Youtube uses bots while LINE does it manually, both of which have positives and negatives to them. Bots allow freedom from personal bias but have increase errors. Manual allows for less error but leads to bias. Thankfully, LINE is apparently quite accepting of mature material. Hopefully that will continue.
Which again kind of leads to my previous question. Why would LINE use a program that most of its site couldn't be used for?