The combined U.S. spot Bitcoin (CRYPTO: BTC) exchange-traded funds returned to net outflows on Monday, having recorded net inflows every trading day last week, totaling $860 million. Inflows of $165.9 million from BlackRock’s (NYSE: BLK) dominant IBIT ETF (NASDAQ: IBIT) were not enough to help overcome $302.6 million in outflows from Grayscale’s converted GBTC (ARCA:GBTC) fund, leading to a total net outflow of $85.7 million yesterday, according to CoinGlass data. Fidelity’s FBTC (BATS: FBTC) was second with $44 million worth of inflows on Monday and Invesco’s BTCO (BATS: BTCO) was third with …