There is a big turnover on the stork martet and shares of the companies pass audit before getting to the stock market. But even on stock market investors lost money and very often. Cryptocurrency market more dangerous then stock market.
Of course, on the markets are losing money. To one earned, the other must lose. A crypto market is no more dangerous than a stock market. But each market has its own properties.
As you gain experience, you can learn to earn more in the cryptocurrency market than to lose. But for this you need to be attentive and have a desire to learn.