I have used RobinHood just a little bit, and it's not my main brokerage. However, I take issue with your phrasing. You start with the premise that whatever it is that RobinHood is doing is bad, it's impossible to argue against this where you are standing.
I hate the app that my main brokerage provides, but it was even worse before RobinHood existed. When I bought my first set of shares on RH, I was amazed by easy it was, and how well designed the UI was. IIRC, it is also super easy to find information on the stock that you're trading, so it's not like they are making the UI dumb.
I have read criticisms like how they make buying a stock seem inconsequential, but that's frankly pretty absurd to me. Do they need to make their UI flow less smooth, or give some big warning that people are dealing with real money?
If there are any parts of their app which encourages gambling, I agree it should be removed, but the actual criticisms I read are things like "they use bright flashy lights like slot machines" which seems very unconvincing.