GEO_ROBOTS_NO_BLANKET_DISALLOW
A `Disallow: /` under the wildcard user-agent removes the entire site from every compliant crawler. This is the single most destructive line that can appear in a robots.txt, and it is usually left behind from a staging deployment.
Impact is importance multiplied by the confidence tier’s weight — SPECIFICATION 1.0, RESEARCH 0.7, EMERGING 0.3, EXPERIMENTAL 0.1. Two rules backed by the same class of evidence therefore always carry the same weight, which is what makes the score reproducible rather than hand-tuned.