Copying Results?
If thegradcafe had not collected the results, how would yuster have obtained the results in that period. Yuster was up after thegradcafe and, remember, you can't go back in time. How would you get a hold of those posters?
Not all people posted their results to both thegradcafe and yuster. Suppose thegradcafe never existed and yuster was the only website of this kind, how could you be sure that all of these people (who posted on thegradcafe) would have posted their results on yuster. People find out about these websites in different ways and there are chances that they only came across thegradcafe but not yuster.
My opinion on yuster copying thegradcafe's results: Lame
Copying Website Idea?
If whogotin didn't exist, would there never ever be a website for tracking admissions results? You never know. Someone has to start it at some point in time.
My opinion on the guest accusing thegradcafe of stealing whogotin's idea: Not reasonable