By Riley Gutiérrez McDermid Traders have been looking forward to passive earning for quite a while. Robinhood, the trading app used by many retail traders during the meme-stocks frenzy that began in 2020, is once again taking on its more traditional competitors by testing a stock-lending function in beta. Both of Robinhood’s (HOOD) – Get Robinhood Markets, Inc. Class A Report main rivals, E-Trade and Fidelity (FSST) , already have the ability to let its traders earn passive income by lending stocks to financial institutions. A beta version was first spotted in the iPhone (AAPL) – Get Apple Inc…