IIRC, it was canned because it was linked to search performance and was abused on an industrial scale for negative seo. Such a blacklist could be limited to on

IIRC, it was canned because it was linked to search performance and was abused on an industrial scale for negative seo. Such a blacklist could be limited to one's personal account though but, I guess, since there is no monetisation benefit for google they don't care to offer it?