Bitcoin BTC$84,459.46 exchange-traded funds (ETFs) are back in favor, but not yet at the pace that has historically fueled steep rallies. These U.S.-listed funds have pulled in over $1 billion in investor money this week, according to SoSoValue data. Analysts are calling it a sign of renewed institutional bid for the cryptocurrency, with a warning that the pace must remain robust for a sustained uptick in bitcoin's price.