Yes gambling and trading are two completely different fields these have no comparison.
Gambling is based on luck and you will lost your money most of the time but on the other hand trading required knowledge and skills that makes it a great field to earn money through proper hard work.
Yes gambling and tradings are miles apart, but when a supposed trader sets off trading without good enough knowledge, skills and experience, then
there is really no difference. Guess work is no trading and it is only by understanding the market that sustainable profits are made possible other than that, it is all waste of precious time and money.
I basically agree with your point in general
Though I don't agree with such a view when it comes to details. The major difference between trading and gambling if we talk about gory details is that when gambling you outright lose when you lose, so to speak. For example, you have 1 bitcoin, you lose and then you have only 0.5 bitcoin left. In trading however, even if the price goes against you, your losses are fixed only when you close a losing position. But you have an option to wait out the bad times and still get profits even if you were losing at first. This is impossible in gambling where any loss is final and potentially fatal