For years, a Chinese-language market for crypto scammers and money launderers—by some measures, the internet's biggest black market of all time—operated in plain sight on the messaging service Telegram, facilitating tens of billions of dollars in illicit finance. Now, thanks to the scrutiny of one team of crypto crime researchers and Telegram's ban hammer, it's gone.Haowang Guarantee, the crypto-fueled crime bazaar more widely known by its original name, Huione Guarantee, declared in an announce...