It is a reverse SEO technique which is used for increasing yours rank and decreasing the competitors rank.
Google Bowling is a black hat SEO technique used to knock competitors down or out of search engine results. It is a form of SEO sabotage that is conducted by pointing hundreds of questionable links from low quality sites at a competitor's site so they end up banned or penalized by Google. Generally newer sites are more susceptible to Google Bowling as older sites are better established with a range of existing high quality links.
“Google Bowling“, also called “reverse SEO” is a technique, based on the simple fact that there is a second way of getting on top of the Google search results:- increasing your own rank -*decreasing your competitor’s rank.Google Bowling is an SEO technique that is capable ofdecreasing a competitor’s rank in the Google Search Engine.
This may be the worst thing in SEO world to harm other websites. I hope Google would find a solution on this.