You state: "What interests me a bit, are the new applications that crypto-currency allows for: "smart contracts", "decentralized autonomous organizations", machine to machine transactions." None of these are new: smart contracts - options; decentralized autonomous organizations - commercial banks; machine to machine transactions - internet transactions and ATMs. The environment might be different but the ideas and their applications already exist.
Well I've never gotten a overdraft with Bitcoin. Banks are designed to make money, BTC is designed for people to transmit $$ through it easily. No middleman=more efficient
Same goes for ATM's and internet transactions, Paypal charges $.30+2.9% CC fee to pay for goods, BTC costs $.03. Even if you use a ATM with $0 fee, your bank will probably charge one.
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for smart contracts, there's a lot they can do that simple options can't.