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.