gagabux is scam????

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I am a student, I want to earn money online, I search in google, then I join in gagabux to begin earn money as I thing, many people tell me, gagabux will pay in 2$, but now I have 6$, gagabux not pay, and said upgrade to premium account to cash out. the other tell me: gagabux is scam, don't believe in gagabux. you can tell me : gagabux is scam???