David Marcus, head of the Facebook blockchain and director of the Libra Association, said on Wednesday that bitcoin is digital gold, but not a good currency for trading. Marcus said that I don't think Bitcoin is a currency. He believes Bitcoin is like gold, because people can hold it as an investment like gold, but the sharp rise and fall in bitcoin experience makes it a bad thing for people who need cross-border remittance systems. select. Marcus said that the reason why Bitcoin is not regulated is because people don't think Bitcoin is a medium of exchange.