So your bias is reduced - you really don't know what will happen next.
Isn't it even better if people can use a live price chart from CMC or TradingView? That way anyone can literally try to trade using their skills and not relying on historical performance. I think it would serve better as an alternative for demo trading platform.
This app is all about training pattern recognition. If you use live chart, you have to wait hours or days for results. With this app, you have to click "Next" and you have your result in seconds.