There are event you can predict on that even though it's not 💯 guaranteed that you're going to win, a level of certainty makes you think that you're surely going to win.
The downside of that feeling is that you might become over confident to use a big amount in the game since you're to a large extent certain that you're going to win.
Can we still say we are gambling if the event is something we are at least 90% sure that we are going to win?
A high probability of winning often convinces gamblers to bet more - but it never guarantees a win. Probability is simply a possibility and isn't a guarantee of winning. When it comes to sports betting, you shouldn't focus solely on probability. Sometimes you should also consider other unexpected events that occur during the game. Even though the team with a high probability of winning is likely to win the match - there is always a chance that you will lose the bet because they lose or draw.
Betting based on probability certainly allows you to win - but how much you can bet is up to you and how responsible you are. One person may only be able to afford $10 - another $50, but you may be able to afford to lose $500.