Once there are no more deposits the Ponzi scheme automatically collapses.
I collected ~250 BTC from TheGrandBitcoin in 5 days only and then the system collapsed. Be carefull players, I wish you all good luck.
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Same here. Started with 0.0005 and made it to 10$ with btcdoublex.com and then it collapsed.
Look at the unpaid amount.. That's what I'm talking about:

(an old print of a round)