The Notion of negative SEO became more prominent after the Penguin link spam update caused site owners to become more aware of the state of their inbound links. The same has been done for search engines like Bing, and conscience some years, Moz conducted a Premier organic ranking factors survey https://directoryecho.com/listings292378/des-notes-d%C3%A9taill%C3%A9es-sur-robots-txt