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Very interesting stuff coming out of Mark Cuban's mouth. I'd venture to say more than half of bitcoin/crypto investors believe that some of these alt currencies are a bubble. The only question is when they'll pop - I don't think it's anytime in the next year.

Definitely some shady investments out there. I think the ICOs are what have people thinking there's a bubble. Did you see the BAT ICO the other day? It sold out in 24 seconds. I bet half of these investors are just throwing money into projects without knowing much (if anything about them).