You bring up a valid point, sklopan. While demo accounts are excellent for learning and practicing, they might not fully prepare traders for the emotional and psychological aspects of real trading. It's in the live market with real funds that the true challenges and learning experiences come into play.
For those who don't know how to buy a coin, how to sell, how to set stop loss, take profit, etc. Demo account will be very useful. But if you already know them then it is better to trade with real money instead of using demo account. Because you will fully understand when you make a wrong move and lose. Because people learn the most from mistakes. You can't learn well if you don't make mistakes. But it is better to start trading with small amount of money in the beginning
Before I tried the demo account, it's nice for practice, but when you truly do it to earn money, making money first is extremely different, so instead of a sample account, it's better to perform your own trading on an exchange.
It also does not imply that if you mimic other people's trading, you will make the same profit. That is not correct. Why haven't you noticed that if you copy something incorrectly, the output will be incorrect as well? Is it clear that what you copied incorrectly will not still be correct?