A wildly popular oil ETF has been cut off by its broker from buying futures, limiting its ability to meet its investment objective (USO)

10:36am PDT - May 22nd, 2020    robinhood - Business Insider

• USO — an oil exchange-traded fund that's wildly popular with traders — has been cut off from buying oil futures contracts after a surge in volatility saw oil prices turn negative last month.
• RBC Capital Markets has informed United States Com…