It was good at and ignore what it was bad at

Bitcoin will do to banks what email did to the post office. Email didn't make the post office irrelevant but it forced the post office to focus on what!it was good at and ignore what it was bad at

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It will not. Near zero throughput, slow, wth high fees. Email is free, the are no throughput or tx speed issues

Why Bitcoin and not one of the other 1542 crypto currencies currently in circulation?

The post office, at least if we are talking USPS, was for many years once likely the only profitable unit of government. I get mail 7 days a week now. I still agree with the tweet, they adapted.