They usually took profit from occasional pumps and dumps, it could be easily done if you trading short term because these pumps and dumps are like waves, there's time when it goes down but it will surely make a recover if the coin is good enough. By that, despite the bearish market they could still make some money and the rest of them more specifically long-term trader always bag holding and keeps buying when the coin is at its lowest point.
All these traders make such a huge point to talk about all the profits they make during these crashes,,, but I bet you they hide majority of the losses they make.
I personally think the only money they make is from idiots who pay for their signal subscription. It seems the only way to make money from trading is not by trading;)