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You're missing the point that whether it goes up or down doesn't make it a "scam".

English may not be your first language, but a scam or fraud means there was dishonesty involved, it doesn't mean the price went down.

I don't know what the significance of December is. You could easily be right, and then it could easily be much higher 5 years from now. That's what happens when you speculate on new things with big risks and big potential. It doesn't mean somebody scammed you if it goes down.