A JPMorgan Chase and Co (NYSE: JPM) report sees Grayscale Bitcoin Trust (OTC: GBTC) investors who bought GBTC at a discount pre-ETF approval taking full profits, rather than shifting to cheaper spot Bitcoin ETFs. JPMorgan Warns Of $1.5 Billion More Outflows In a research note shared on Friday, the bank’s analysts, led by Nikolaos Panigirtzoglou, stated that the value of Bitcoin (CRYPTO: BTC) has diminished by more than 15% following the recent introduction of spot exchange-traded funds (ETFs). Since this launch, GBTC has experienced an outflow of approximately $1.5 billion. The analysts observ…