What other options for backend besides Bing are there if one would like to do make a new search engine?
Let people compete over what to do with the raw data (data which is of course publicly accessible but subject to the strange inequities of crawling), how best to process and present it, not over access to it. DDG has to pay Yahoo! for a BOSS license. That is just strange when you think about how the raw data was obtained. It is publicly available information.
Nothing against Yahoo! for doing that (selling access to publicly available data), as there are many other examples of this practice across web- "everyone else is doing it". But I do not think it is "the right thing" to do.
http://www.ysearchblog.com/2011/06/27/ydn-qa-with-duckduckgo...