Trading and gambling are closely related the same as investment and gambling are very closely related. I think trading can be counted as gambling just because your hoping for higher prices when it may never come.
Trading and gambling is a big difference, in gambling we cant predict the outcome it's based on luck, the only way to predict gambling is to play skills-based gambling like sports, research and analyze the team could make us on profit. in others hands, trading, we are not hoping the price goes higher but we predict it using technical analysis.
We can never be sure of the outcome in gambling especially if it's something that you are not used to having. If you think that you will have to increase the chance of winning in it, it's okay because you can by applying strategies in gambling and that would significantly improve your performance. In trading, you will risk your money in a way that you hope that you will profit, like the price of it rising.