I do not think that gambling is like trading, sure they are similar with risk but that is the only similarities they have, the big difference is that day trading has a return of investment while gambling obviously do not have.
yes of course gambling is very different from trading, when you trade and the price falls then the only change is the estimated value of your assets whose value can recover when the price has recovered, whereas if you gamble and you lose then your assets will not be able to return again because the armpit is gone it will forever be gone.