>>51678
Not sure about the yakuza, but sites catering to the petty demands of Japanese authors to only allow fans to enjoy their works in the manner the author wants isn't unheard of. First time I encountered this was Kenkou Cross throwing a bitch fit when people noticed the amount of grim dark he unintentionally wrote into Monster Girl Encyclopedia because he was so focused on the sex parts he didn't actually do a great job with the world building. A combination of people writing stories running with the grim dark and getting trolled over his world building being bad enough that the grim dark is the only way it could function led to the majority of MGE fan sites banning anything KC didn't like as "anti-monster girl" content. It really didn't help a lot of the stuff he said to fix it or clarify things made it worse, that he blamed bad translations (which very obviously wouldn't explain all the grim dark away) or that he outright stated that if his Mary Sue Demon Lord actually did lose every Monster Girl would immediately turn back into actual monsters that would promptly torture, eat, and/or kill their male husbands and lovers. The entire thing was stupid and is why I completely lost interest in anything KC has made because he comes off as a whiny pissant that can't handle anyone not using his sandbox exactly how he wants. Point is this is just something in Japanese culture that they take the wishes of the author more seriously and it's not unique, but most authors aren't like that.
Closest thing in the West is authors that are antifanfic leading to fanfics of their works being banned from major sites. Anne Rice and George RR Martin are notable examples though Anne Rice softened her stance on that later. Most authors in both Japan and Western countries realize that banning fanworks really only antagonizes the fandom and lowers the potential audience. Plus it's free advertising.