AsianFin--As of Monday, the U.S. Bitcoin ETFs have recorded the longest single-day net outflow since their debut earlier this year, marking a significant shift as investors pull back from high-risk assets amid global market challenges. According to data compiled by Bloomberg, investors withdrew nearly $1.2 billion from 12 Bitcoin ETFs over the past eight days, ending September 6. This downturn coincides with a period of turbulence in the stock and commodities markets, driven by concerns over economic growth.