On the KOtoys forum itself (link below courtesy of fullmetalhero) the store owner says he was pressured into shutting down by some "company". Whether or not it was actually Hasbro, we're yet to find out.
What's interesting though is that he's still siphoning / liquidating the remaining stock and honoring preorders. The crackdown by this unknown company on KOtoys clearly hasn't taken on a very hardline approach if he's still able to operate for the remainder of the year.
https://www.kotoys.com/forum/index.p...ic,2161.0.html