According to statistics, in the absence of trading strategies and trading advantages, trading in the foreign exchange market with a risk return rate of 1: 1 has a 50% success rate (minus costs) in a series of transactions. So in the long run, (real) random entry and 1: 1 risk return trading are similar to random coin toss, and most traders should break even.
Perhaps the main reason why most traders lose money is that they have almost no self-control, and they can't resist the temptation of excessive trading and excessive leverage when no one is in charge.
Another main reason is that they try to trade against the trend for some reasons, although they know that following the trend and sticking to it will have a much greater chance of making money.