I was surprised to see Alpha Vantage[0] on this list. As far i'm aware, they provide real time access to stock prices, and their service is free. Additionally,

I was surprised to see Alpha Vantage[0] on this list. As far i'm aware, they provide real time access to stock prices, and their service is free. Additionally, other services [1] exist that do the same, which are also free. How might they turn their service into a viable business? [0]: https://www.alphavantage.co https://www.alphavantage.co [1]: https://iextrading.com https://iextrading.com