2012 CTR De-duplication Tools 
SmartBug Media
MARCH 17, 2020
Duplicate Content: Copying and pasting your content, and publishing it on multiple sites all over the internet is one of the easiest methods spammers use to penalize your site. De-indexing The Site: Changing your robots.txt file from the server to remove you from search. Obviously, Google wants everyone to play by the rules.
seo.co
OCTOBER 4, 2020
Otherwise, you’ll run the risk of search bots getting confused; they may see two versions of your site and register them as duplicates, or they may search for nonexistent pages, or they may even rob you of your domain authority entirely—like what happened to Toys R Us in a major SEO blunder back in 2014. Image Source: Robotstxt.org ).
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