Everyone know this that they should only invest that money which they can afford to lose but in practiice only few people follow this practice.
That's because they are greedy. People become crazy to put all their money in crypto after they succeed to take profits at the first attempt. But then, they regret it since there is a huge correction after a big pump. It happens in most altcoins, especially those meme coins. Doge and SHIB ever skyrocketed, people think investing money in these coins is safe enough with support from Elon Musk. But finally, they lost their money after the hype of these coins are over. From these phenomena, we must learn that no coins safe enough to invest with all our money.