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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.

For that to work, it would seem that -source:sourcename would also need to be implemented. Not sure how useful that would be outside of pixiv though, since it alone is unique how it currently makes up ~16% of the total images on yande.re