Probablemente reclamos de derechos de autor.
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ANow the question is who would claim copyright to a drawing or animation +18 knowing that there are a lot of drawings of many characters with copyright?
Why should mura take the risk? If someone is suing him or fantia, his lifelyhood itself is in danger. It`s not some funny free project, he does this so he can pay his food.
I have no idea how Japanese copyright works, but I presume if an original publisher is motivated, he could nuke all of those too. It`s just it isn`t worth the effort. But mura has 19k follower on one of japans largest adult sites. There is a risk that mura is obviously not willing to take (anymore).