Cryptocurrency exchange Huobi experienced a net outflow of over $73.3 million this past week, coinciding with the detention of several of its top executives by Chinese authorities. The exchange's stablecoin reserves have also decreased by 33%, settling at $99.47 million over the week. Huobi advisor Justin Sun tweeted the number “4”, a term often used in the crypto sphere to address situations filled with fear, uncertainty, and doubt.