When someone is making money from trader then you can't say that person lose money in it. Are you trying to say that someone who lose trades how can that person still make huge profits? If that's the case then it's simple, someone who losses a few trades and wins a few good amount trades can still be profitable as a trader. It depends on the win rate, some traders maintain big win rate at 70% or even more than that.

Those traders also lose some trades but in most trades they win instead of losing. Even the best trader lose some trades and that's why they place stop-loss to reduce the losing amount to minimum. While such traders can also set some good take profit points to earn more profit from their trades.

Let's say someone has bough Bitcoin at $52k, now he/she sets stop loss just 1% below the buying position while he/she set take profit at 2%, now even if he/she lose this trade and win the next one he/she is still going to be profitable even after losing the first trade or many such trades.