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Shoters make big volumes of trade. They constantly buy and sell crypto and market became more active.
In general, this applies to all short-term traders (not only shorters).
During 1 day the rate of crypto can change for 10%-15% or even more. It is realy a big profit.
Due to the volatility of the market is around the clock activity, for the trader there is no need to expect the right moment, they work in the short term.
It is not necessary to wait all period of grows or fall. They take small period of time just fix a profit. And a risk is minimal. They have a lot of orders during a day.