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But the difference is I can find out who runs the bank, I can sue them in court if I have to, or criminal charges can be brought against them if they've broken any laws. I am pretty sure whoever runs Bitconnect is not based in the USA, but somewhere in Asia, and their identity seems to be a closely guarded secret.

Ok, you are right. But what if someone steals your bitcoins or ether? =) On which court you will sue? Crypto is just trust - if the most people don't have trust in it, it won't work.