Bing changed there Webmaster Guidelines, and letting us know that Keyword stuffed pages can be demoted or delisted from #bing
Just found that:
Keyword Stuffing
When creating content, make sure to create your content for real users and readers, not to entice search engines to rank your content better. Stuffing your content with specific keywords with the sole intent of artificially inflating the probability of ranking for specific search terms is in violation of our guidelines and can lead to demotion or even the delisting of your website from our search results.

URL:
http://www.bing.com/webmaster/help/webmaster-guidelines-30fba23a

FYI
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