The New York Stock Exchange is nominally the largest public market in the world, but its real-time data subscription fee is $8,400 per month, plus an additional $78 per professional user. You can build an algorithmic trading system on Robinhood or Schwab's API, but you can't access the NYSE's order flow in real time—because the data belongs to the NYSE, and if you want to use it, you have to pay a high price. In the AI era, data is king, and everyone has personalized needs. Yet a developer trading with their own money in their own brokerage account still can't access market data via programs to compete. It's hard to understand.