Crypto and barter trading has some similarities.
Barter is a decentralized system of buying and selling of goods and services. The individuals own their goods and exchanged it with another person goods. As that the government can not control the barter system of trading and that the same method is applying to Crypto Currency trading.
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I still believe that barter system might still come back again from the evolution point of view.
Karl Polanyi's student George Dalton (1926-1991)
demonstrated in 1982 that barter did not play a role in the beginnings of market society.
Furthermore, barter itself is an instant transaction while buying/selling is a debt contract with a scheduled pay date.