Robinhood (HOOD) just switched on crypto trading for its UK customers. Traders there can now buy and sell more than 50 coins, including Bitcoin (BTCUSD), Ethereum (ETHUSD), and XRP, through the Robinhood app, with no trading fees. This launch seems to be Robinhood’s attempt at fixing its only weak segment during the last quarter. The company, best known for its crypto business, reported $100 million in cryptocurrency revenue, down 38% from a year earlier. What’s interesting is what that decline did to Robinhood overall, which was almost nothing.