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You could say these things for any other altcoin ... hell, you could say the same for Bitcoin. What if Satoshi starts selling his stash? You can keep saying "what if, what if, what if" and keep scaring away from all investments, you'll miss another train.
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Exactly, that's how all crypto markets work. And this is good because there'd be no price action otherwise. It can scare only someone who gets this wrong. Decred hasn't had its bubble yet.