In a word: curation. Amazon is probably always going to be the most relevant search engine for their site, but the current choice for python searches may not b

In a word: curation. Amazon is probably always going to be the most relevant search engine for their site, but the current choice for python searches may not be. An example similar to python but that I have first hand experience with is Perl's CPAN searches. There are two search engines for CPAN, http://search.cpan.org http://search.cpan.org and http://metacpan.org http://metacpan.org. DDG's !cpan originally defaulted to the first one, but at the time it's results were not as accurate or informative as the second one. Upon appeal the DDG people switched the default to http://metacpan.org http://metacpan.org providing everyone who used the !cpan results with what they felt was a better result.