Now if we compare that with trading, you can find the percentage of profitable traders to be relatively higher than successful gamblers, why? The answer is simple: trading isn't completely dependent on one's luck and one can learn and do trading in a proper and effective way, whereas one can't do the same in gambling.
This comparison is incompatible because trading is a skilled based field while gambling is purely based on luck. By learning the right skills and strategies, it's possible for one to become an expert and successful trader but on the contrary, gambling as a game of chance is difficult to maintain a consistent win on a steady. Trading also allows traders to hedge and minimize risk but gambling has nothing like that. Once you click on bet, you either expect your money to return in folds or you consider it gone. Sometimes, traders take advantage of market data and analytics to make decisions while gambling in every aspect is luck reliance. Although both trading and gambling maybe somehow similar but difference is very obvious.
Yes, I agree with you or it could be said that to gamble, a beginner only needs to bet on something he wants, for example a casino game, even though it is the first bet, many beginner gamblers are lucky when betting carelessly on a game and if it is done in a beginner trader's trading may really need research skills before starting trading.
What certain is that if we talk about the differences in gambling between trades, they are very different, even though some people say there are similarities between the two, but if we understand in depth there are many differences.