Comment by dRother

It has a lot to do with Reddit in that Reddit was available, better, and already fairly well known. It's not like the article could possibly go "How Digg's Whatever Benefited Mixx.com". Reddit was basically standing there ready to soak up Digg users once masses of them stuck their heads up for long enough to notice that Digg isn't really that entertaining or informative, and other sites may suit them better.