While I am really glad Robinhood existed back when I started working to introduce me to investing, their amateurish ops (see their outages in the past few years) and customer support (they managed to bungle a position transfer costing me a few hundred bucks) pushed me to more established players. Most of these established players now have low to zero commissions with much better customer support, order execution etc. I doubt any serious investor uses (or should be using!) Robinhood.