Probably because language and general expression are moving objects. It is a very recent trend indeed ( http://ngrams.googlelabs.com/graph?content=%22ridiculou

Probably because language and general expression are moving objects. It is a very recent trend indeed ( http://ngrams.googlelabs.com/graph?content=%22ridiculously+easy%22&year_start=1800&year_end=2010&corpus=0&smoothing=0 http://ngrams.googlelabs.com/graph?content=%22ridiculously+e... ) and I guess it has something to do with people getting their inspiration from other startups, who also used the expression...