Sorry but this type of getting something for "free" mindset is what sets up folks for successful scams. It plays off of people's greed and on the other side, someone is waiting to pounce and capitalize.
As I said, I just found the whole thing hard to believe. From the comments on this thread I understand it's actually possible to earn bitcoins for free but it's not advisable. " A waste of time " as the first comment said
You're right though, it's only greed that can drive someone to look for free bitcoins