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Yes, it is very easy to turn trading into a gambling game and it will depend on the trader's attitude to trading. And if a trader does not adhere to a trading strategy, violates risk management, then such trading will be comparable to casino, where the result depends on luck, not knowledge.
Without skills and knowledge - trading is definitely called gambling.
Traders don't rely solely on price volatility, even though it's what can generate profits. Analysis is necessary and they need to study several indicators to determine the best time to buy. Traders who are called gamblers rely solely on luck - meaning no analysis, just buying randomly and waiting for the results. So I have to agree that traders and gamblers are fundamentally different.
What distinct gamblers and traders is luck. One depends on luck and the other one doesn’t rely on luck but on what you know and can analyze to give best results in the market. Trading will make you consistent profit if you’ve understood and become a better trader through adhering to all skills needed for a profitable trader to have. Trading is not luck and that even makes it very hard to learn through and reach the state of profitability unlike gambling which you can prevail in with or without idea of the game you want to bet on, strictly based on luck and not knowledge. When you have skills in trading and you employed it in your trades, you are a trader but when you don’t and just trade as you wish, you are no more different from a gambler who rely on luck only to thrive.