I don't understand one thing. Predicting a price of a stock or derivative for next 24 hours should be much easier task. We have a tremendous amount of perfect q

I don't understand one thing. Predicting a price of a stock or derivative for next 24 hours should be much easier task. We have a tremendous amount of perfect quality data to train our models on and to infere from. Having those prediction accurate enough will be an Eldorado. And still no one solved that problem. Why Zillow ever thought they gonna solve much more complex problem with much higher risk using much worse data?