How you can be sure that trading is different than gambling

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trading itself is highly luck based, you can't predict current war that caused market to dump so hard, if you do you would've shorted it.You can try technical analysis but most of them are self fulfilling prophecy, at most they increase odd from 0.50 to 0.51. In literal sense both are the same speculation on probability.
Except trader just want to be recognized differently

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Maybe you took trading as gambling that's why you said it's based on luck. Trading is risky as well just as gambling but gambling is an activity of probability and not something you can rely on as your source of income but their are successful traders on the long run. If you are good in analyzing the crypto market, you can maintain a long term profitability.
Addiction is something we see everywhere whether you are a trader or gambler, addiction will surely come close depending on how you trade the market and how much time you are dedicating to it. As a trader if I put much of my time into trading, I would be become addictive to it but this is a gradual process and it doesn't occur immediately or in the shortest timeframe. Addiction is real and we should be aware of it.
Addiction can happen to anything, but you must understand that a person becomes addicted to something only when he has the wrong mindset towards a subject and starts making wrong decisions about it. Trading is a skill-based place, here the more skilled you are, the more likely you are to make a profit, but the chances of getting addicted here are very low. But addiction can happen for any reason, no one can deny this, so we must be careful and do anything, anything in excess is bad, so we have to do anything in normal quantities.