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@Kyle I don't know. It might have been a difference between when you joined (there was an early and a later group of testers), or based on the amount of reputation you got during the beta duration. (I was in the top 5 out of around 50 testers)
Just as an addition, if you are going to test your library, don't use a key (that is what no key is for). However, make sure the final product demands and API key.