I have given a thorough read through Clanta's ban appeal, and based on the evidence, I'd say he has been wrongfully banned. Of course, I hold no authority in this case; I am no GM. However, due to him being a frequent streamer, I would say that his chances of exploiting Butterfly Droplets is very low. As mentioned above, an exploit would be easily noticed by his audience, and would result in some suspicion. This has never happened. Therefore, I would conclude that he was wrongfully banned.
I hope that this issue gets resolved soon. It would be amazing to see that even if someone is wrongfully banned, they can redeem themselves through persistence and hard work. It would help the reputation of Nexon's support system. As stated in previous replies to this thread, Nexon's support system is questionable at times - there are automated responses with grammatical errors to many tickets. If actions were to be taken by GMs, it would result in good publicity, thus helping the company overall.
Anyway, best of luck to Clanta; I hope to see his account restored to its former glory.