Not everyone losses money when the market is down.Those who are invest their money for short time or they much needed money may be they looser.But on the other hand whose who hold their bitcoin for next time when price will be high they will be gainer.
You can always short the market, that way you will earn a lot of money when the market is going down, but as you may guess doing something as that is very dangerous especially in a market like bitcoin where the price has a tendency to skyrocket, there have been cases of people that lost everything because they were shorting bitcoin at the wrong time.