Don't worry, Google is working hard to keep competitors from harming your rankings.
Should you notice an unnatural link blast aimed at your site...simply contact the thousands of site owners in question, and kindly ask them to remove the links. Whatever you do, don't contact Google about it, as they "don't control the content on these pages."
http://support.google.com/webmasters...n&answer=34449
Quote:
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Google works hard to prevent other webmasters from being able to harm your ranking or have your site removed from our index. If you're concerned about another site linking to yours, we suggest contacting the webmaster of the site in question. Google aggregates and organizes information published on the web; we don't control the content of these pages.
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As posted before in this thread:
https://gfy.com/showthread.php?t=1066383