If big, boring banks aren’t worried about the rise of Robinhood Markets (NASDAQ:HOOD), they ought to be. Robinhood stock is volatile, but holding shares makes sense if you believe the financial-trading landscape is changing. Instead of fearing change, you can choose to accept and even embrace it. There’s no turning back the clock and no undoing what Robinhood has done for the financial markets during the past decade. So, get on board or and get ready to make some money, or just get out of the way. Tradition ...