I am an amateur trader for pure hobby because of Robinhood.
Many years ago, I tried to create an etrade account and it was an insanely long process (it may have changed now). I don't even remember what I did after I got an invite from a friend, but I was up and running right away.
I started trading $300 just to see what it was like. The first three months, I learned a bit and lost some money. Fast forward 1 year to now, and I have around 54k in there and am up 16.05% - and that includes the crazyness of December. I have invited some friends and they all trade between $300 to 10k AFAIK. I am in no way rich, but I compare the performance of my retirement portfolio to what I do with a few ETFs, and honestly it has demystified the whole process. Before, I used to login to Clash of Clans when I had a few minutes to spare, now I spend that time browsing Robinhood. To me Robinhood was a game changer for this and many other reasons.