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trading in spot will not making someone losing $1500 within 3 days, because even BTC market very volatile, lets say his friends entry at $66.9K (july 2026) and based on today price (at this post) $62.9K,
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he just losing 6% from his capital. and it wouldn't affect anything for him, right? but it will be different if his friends playing with high leverage to get instant profit. i agree it's just a gamble not a trade anymore, because he buy a prediction for "short" or "long", if the prediction wrong just need he can lose faster.
He lost because he did futures trading, and not spot trading. Like what you said, no one will lost that huge of an amount in just 3 days.
It's quite unfortunate to see traders losing money that quick, and this is also the reason why we need to balance our knowledge in trading with the amount of money that we're putting in order to prevent more losses. If we are just starting, just put a small amount of money and always be ready on losing it. Now as you gain more experience, knowledge, and you already have a strategy that works for you then that's the time for you to scale up and increase your capital. Problem with some is that, they want to start big to maximize their profits without thinking of the possible losses that they'll incur.
Trading is gambling for traders who don't know how to manage their risk. I do hope that this friend that OP has shared already stopped trading for a moment and analyze his losses, or maybe quit trading completely if needed.