(Bloomberg) -- The biggest US cryptocurrency exchange could fall victim to a slump in Bitcoin and waning enthusiasm for exchange-traded funds that invest directly in the digital token, according to JPMorgan Chase & Co.Most Read from BloombergChina Weighs Stock Market Rescue Package Backed by $278 BillionIndia Tops Hong Kong as World’s Fourth-Largest Stock MarketAn Isolated Israel Doubles Down on War in Gaza — At All CostsNetflix Pays $5 Billion for ‘Raw’ in Bet on Live EventsHong Kong Stocks at