The "non-targeted commercial anchor text" refers to any keywords that are not using your site's brand name or URL. 

You probably don't have to do anything about them - we just have a warning to show you when you have links using potentially unnatural anchor text. It's best to have most of your anchor text using your brand name or different combinations of the linked URL, to make everything look natural. 

If you have too many links (above 50%) using non-targeted commercial anchor texts, then you might have a problem.

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