i considered trading as a gambling because you may lose your money and you can also gain profit and both gambling also you can earn or lose but gambling has a house edge like that and trading have a commission
i think in trading when you buy some altcoin let say in rate 10 satoshi with amount 1000, and then in 15 minutes the rate is down until 8 satoshi, we are lose in money, but actually we only change our money with altcoin and i am sure this altcoin will be get pump soon or later. so we still get altcoin in our wallet.
but in gambling, when you make a bet and you get lose, you loss all of your money, nothing left. and there are no hope that your money will get jump soon or later like altcoin. both are too risky, but we should reduce the risky to play safe and we should not lose all our money, but maybe for small amount.