well gambling has a clear definition. it is something that you can not predict at all. it is 100% pure chance. for example when you roll a dice or flip a coin there is no way to know what the result of it will be. meaning pure chance.

but when it comes to trading and prices, it is hard to predict but it is not 100% unclear. you can expect certain scenarios to happen with different levels of certainty based on the market situation. and that is a big difference that makes it distinguished from gambling.