"Crypto currency could vanish in one day not like banks, banks can't just disappear since they have phiscal branchs" -My Teacher

He was talking about money in the world and how it evolved from salt to the papers that we use today and for which there is gold, so it is the best barter system used by mankind, when I asked him about his opinion on cryptocurrencies, he said, “Cryptocurrencies may disappear within one day and may disappear in a moment if internet go down but not like the money that exists today, as the banks have branches all over the country where you can not only disappear and you cannot lose your money that simple"