I love Robinhood because it has made trading so accessible to me. I started out by putting in $100 and as I gained confidence and started doing more research, I started adding more funds. I've tried many services in the past - Schwab, ETrade, Scottrade, and they all felt a bit too "heavy-weight" for me. I don't have significant amounts of income invested, I just want something low friction that I can use as a learning tool. I have friends who are more "serious" investors and they don't use Robinhood, but I see Robinhood satisfying a different use case at the moment.