I don't understand how someone loses their balance every day when trading - are they gambling or maybe trading with high laverage?

Recharging your trading balance every day is almost like a gambler recharging his gambling account. The wrong approach to trading can make traders lose money - but if they don't sell ^{[spot trading]} then they don't have to worry. Spot trading is better for anyone who wants to trade more safely - but the risks are there, although not as bad as futures trading.
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 Most likely, we are talking about futures trading, but it is difficult for me to even compare it with replenishing a deposit in gambling, because personally I do not replenish the deposit every day, and not even every time I play, maybe this happens to those who play slots. The same comparison can be made with those who are keen on futures in day trading, probably in such a case there is a very high probability of losing the deposit. But I do not think that a trader will endure trading for a long time in such a mode, he will very quickly understand that he is doing something wrong.