Using "nginx" in DDG will never return websites that have apache2 (and not a single mention of nginx) as a match, Google will.
As for the last sentence, I was using the said example to generalise that it's far better to learn which website is right for the query and add a bang. In this case "<something obscure> nginx !sf", which will return serverfault.com results, which also won't do this stupid thing of equating apache2 and nginx.
As for the last sentence, I was using the said example to generalise that it's far better to learn which website is right for the query and add a bang. In this case "<something obscure> nginx !sf", which will return serverfault.com results, which also won't do this stupid thing of equating apache2 and nginx.