>>149834476
Anime and manga have a lot of fans (usually lefty anglos) affected by the "failed writer" syndrome, where they watch/read a thing, enjoy the thing, but think it would be better if THEY did some reworking on it. A common fantasy, right? Now add to that the narcissism and pretentiosness to think it's a fantasy EVERYONE ON THE INTERNET should know about and agree with. They push it everywhere they can and some even make it when they have to adapt the anime/manga they liked. I think this is how things like Netflix's Death Note came about. Deep down they know they won't ever be able to make something original that is just as popular as said anime or manga, so they go full parasite on things other people make.
At no point in their egocentric minds do they even question wether the "rework" they have in mind would actually make those things WORSE.