Robinhood Markets (NASDAQ: HOOD) has changed the investing game with its easy-to-use app and commission-free trades, which pushed the rest of the industry to get rid of trading commissions. While the buzz around Robinhood might have waned since the trading boom during the pandemic, the platform is still popular with millennials, and that makes it a good source for investing ideas. Like Robinhood, Airbnb (NASDAQ: ABNB) is another disruptor enabled by the mobile economy.