网红券商Robinhood在区块链平台向欧洲交易员提供美国股票（投资服务）。

Group 1 - The core viewpoint is that Robinhood, a popular brokerage firm, is expanding its services by offering U.S. stock trading to European traders through a blockchain platform [1] Group 2 - The move signifies Robinhood's strategy to tap into the European market, potentially increasing its user base and revenue streams [1] - This initiative may enhance the accessibility of U.S. stocks for European investors, aligning with the growing trend of cross-border trading [1]