It is good that they get rid of "old domains" to help level the playing field. This is a good rule, because everbody starts a zero!! Only the best get a good rank!

I am eager to know who won this contest. Who?

As well as detecting bad phrases, you may find some new good ones. For example, you may see that a keyword phrase you did not optimize your site for brings useful traffic despite the fact that your site is on the second or third page in search results for this phrase.
Using this methods, you will arrive at a new refined set of keyword phrases.