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Can't fail ? Of course it can, your statement doesn't add up factually. The interest paid is more then they make loaning it out. It's a house of cards and will fail 100%

Unfortunately the interest paid is NOT more than they pay out!
If you invested in BCC a year ago Bitconnect made way more money off of holding your BTC than they pay you interest. Its a ripoff but not like you think. As long as the BTC price goes up they can make money and pay the interests they promise.
This is NOT a good investment 4 you!
Best strategy is hold your BTC long term.