The crypto industry can breathe a sigh of relief: It looks like a federal U.S. regulator will let the world's largest traditional finance asset managers and other firms list and trade shares of a vehicle giving retail and institutional investors exposure to the price of a decentralized, trustless, stateless digital asset (if you're in the U.S.). But of course, the bitcoin exchange-traded fund (ETF) drama wouldn't be complete without, well, drama.