They've poured billions into U.S.-listed spot bitcoin exchange-traded funds (ETFs) in recent weeks. The result: these ETFs now sit on nearly $800 million in net inflows for the year, according to data source SoSoValue. That's a 180-degree turn from the red ink earlier this year. Here's how bad it got. On July 13, the same ETFs were down $5.8 billion for the year. That was the low point, according to data analyzed by CoinDesk.