He has no one but himself to blame for what happened. You can't expect to enter a financial market, do trading, and earn a lot of money and do all that without any knowledge and understanding. If the friend was earning profit, and suggested trading to him as well, he had a brain that he could use and think that if he is going to use his money, he needs to understand everything first before he starts investing.
He started trading without gaining enough knowledge about the market or cryptocurrencies, I'm pretty sure he had invested all his money in some shit coin or meme coin hoping to become a millionaire soon because if he had invested in Bitcoin, he would have been in profit already.