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Except it doesn't depend on any particular means of communication. You can print out Bitcoin on paper and physically trade it. You can embed it in an image and trade that. You can physically scan QR codes on each others phones to transmit it. Bitcoin and other cryptos can be transferred via sat phone. The Internet and exchanges are just conveniences.

There are also numerous projects to work around Internet censorship in the crypto space. Such as the Substratum Network (https://substratum.net) and Mysterium Network (https://mysterium.network).