so, we must first equate the concepts so that what we discuss has the same meaning.  first, what is decentralized from cryptocurrency is the blockchain network, and this has been discussed by several of the members above.  second, the exchange can be considered as a financial institution, so it must obtain an official operating license from the government.  I think here it is clear, what is controlled by the government is only the market where crypto is traded, not directly traded goods (crypto).