To get a roundup of TechCrunch’s biggest and most important crypto stories delivered to your inbox every Thursday at 12 p.m. PT, subscribe here. Welcome back to Chain Reaction. If you thought last week was crazy with the U.S. Securities and Exchange Commission clamping down on major crypto companies like Coinbase and Tron, you should buckle up for this week’s news. Binance, the world’s largest crypto exchange by volume, its CEO Changpeng Zhao and Chief Compliance Officer Samuel Lim are being sued by the U.S. Commodity Futures and Trading Commission (CFTC), according to a filing on Monday. The company, Zhao…