For a long time, the play book to improve your online reputation was to get rid of those bad links. However, a company (and I can't remember the name) decided it might be easier to just create better links/stories about the person and let google bury the bad stuff. Therefore when someone searches Bill Smith, they see the good stuff.
Anyways - back to the topic at hand here. Perhaps the solution to these bad bots isn't to try and stop them, but to build better bots that spread #realnews and aren't as toxic? Maybe it wouldn't work, clickbait and catchy headlines are more "share worthy" than the latest WSJ front page article, but maybe we need a new strategy?