Odaily Planet Daily News: Grayscale Bitcoin Trust ETF GBTC suddenly plunged 11% in pre-market trading today, decoupling from the underlying Bitcoin price. Data shows that since its launch on January 11, GBTC has had an average daily outflow of about $137.7 million in the past seven months. As of July 29, the total outflow of GBTC was $18.86 billion. (Zerohedge)