While in terms of gambling of you are only involved with luck base games the chance always relies with your luck though with sports gambling and strategy games, there's a chance that you may also form your winning strategy due to experience and knowledge about the games.
When talking about gambling, maybe we can make some analytical steps in football betting, although sometimes the analysis also experiences errors that result in defeat in certain matches. In this case, gambling is not only about winning by relying on luck, but the prediction process based on the analysis of previous matches also determines, although the prediction is not always accurate.
I see your point and that's true even how deep your analysis things can go south, there's no guarantee inside gambling even how high the percentages of your chosen squad or player a bad performances will lead you losing your pick, upset is always possible and we've that in any types of sports, unlike with regular trading if you just buy and hold and wait for your set target there's always a good chance that the market will bounce and allow your position to triggered and give you decent benefits.