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Trading is not similar to gambling, even if it's futures trading; however, some people do it like gambling.
I think those who make such comparison are those who've failed at trading.
I can't imagine choosing 100x leverage for any trader, no matter how much I trust the cryptocurrency I'm trading, because with 100x leverage, I will have a very close liquidation price...
I don't even see those who use such leverage as risk takers because what they're doing is unnecessary exposure that will eventually blow their accounts. Trading that way shows the person hasn't learnt a thing about Money Management. These one who trade that way are gamblers and not traders, it doesn't matter whether they make profit from such trades or not. Just give it some time and it will dawn on them that they never got it right trading that way.