Gambling has to have risk, so let’s say you have 1000$ and win 80% of the time.
Scenario 1: you bet it all, well you have 20% risk, this is gambling.
Scenario 2: you bet 1/10th if your bankroll each time. The risk is infinitely close to 0 (because you can’t do bets of 1/10th of a cent). This is not gambling.
Also, idk the context of this question, but my dad says stuff similar opposing gambling, but I just remind him he is in the stockmarket. Which is also just another form of gambling, but no one calls it that because the risk is so low.