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.
In trading, the losses should be smaller than wins like in gambling but there is a difference: Traders can use stop loss and limit orders for managing the risk/reward. Gamblers are emotional which makes them weak, traders don't need to make an instant decision because the trading position can go back to the green zone after staying in the red zone for a long time.
Indeed, it has similarities but the way to gain is totally different. Gambling usually doesnt require skills, if you know the game then you can start to play and in order to win you need to become lucky. However there are some games that if you have a knowledge its an edge to predict who might win (e.g. sports betting).
you answered it well, it does not require skills if you are gambling for fun, but there are games like sports betting where you can get use of your skills to win. Sports betting is a skilled based type of game, anyone can start their journey as a sports bettor as it's like trading where you need to analyze.
Anyone can start the trading too but the inner line is to find your edge in trading for being successful long term trader. Gambling is always will be short term and this is the biggest disadvantage of gamblers. Knowledge factor is not the main one compared to the luck factor in gambling.