If everyone gets losses, how are there still people who trade and don't just choose to invest long-term?
What happens is in the beginner trader phase. we cannot avoid losses. Every beginner or even experienced trader who starts trading must also go through this phase. some losses are bound to occur. but it gives beginners more experience and knowledge to grow. so that they can reduce the risk of loss gradually, they will make a profit.
Newcomers who lose money usually return to the market with a new deposit in order to exchange their money for experience once again. And in the end, they will either learn how to trade with profit, or become investors if they do not have the strength to leave the illusory opportunity to become a millionaire forever.
It is not as easy as you said and I advise newcomers to be very careful so that they will not be chasing shadows. Trading is not easy and everyone needs to learn like every writer here states, however, learning alone and even understanding what you learned is not the only requirement to make success in trading, there is more to that. If it is the investment part of Bitcoin, it is still light as one can be following the prevailing sentiment of the market to plan their investments. But in trading, one will need more, they need good expertise in their speculative capability and management, and they also need to control their trading spirits in terms of the psychology of the trader. Any of these three categories can cause traders to fail if not handled rightly which is what many of us are battling with.
It is indeed the survival of the fittest matter when it comes to trading and the smartest traders always stay successful. Sadly, the percentage of such traders is few, so it is not wise to entirely believe that traders can continue to trade and deposit when they lose and will eventually make a success just like that. Many have tried it this way but still trying with no success, while some have already quit when they've wasted enough money.