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KYC has been optional and limit is around 2 BTCs per day. That still seems like a lot. However, it doesn't get away from the hacking issue which is a fundamental basic trust component. Literally, it's like going into a bank and literally wiping out every single penny and the cops didn't even get a chance to react before everything is all gone. At least in a real bank heist, the robbers can only take what the getaway car can hold.