The cryptocurrency crowd has wasted no time in dancing on the grave of China's "FUD" (internet speaks for fear, uncertainty and doubt). Last week's move by the People's Bank of China to ban crypto transactions and mining dented the prices of Bitcoin, Ethereum and other digital currencies, but they've largely rebounded. The bulls reckon the latest attempt by Beijing to crack down on crypto — the seventh, by research firm Fundstrat's calculations — will fail to throttle an asset that bypasses borders and banking systems. They also hope that what seems "bad" for crypto will prove to be "good." Advocates...