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nisnegativeone said:
copyright maybe?
They're not the copyright owner (Correct me if the T&Cs hide this)

Cyberbeing said:
I think the idea is SomePerson007 wants to add pixiv to their blacklist. If that's the case, maybe a 'Source Blacklist' in addition to the 'Tag Blacklist' could be added.
Makes no sense to me to blacklist pixiv images. It's just another publishing medium.