Just to understand, I do not see the possibility of short selling on exchanges...
There are many people who can do that, any trader can make money from a dump coin. It is important, they have enough brains to decide when to buy and sell it. It is difficult to make the best profit when trading.
who earn?
yes i earn from the previous market crash and i have earn by buying at low price and now waiting for right time to sell. i have fill my bags from litecoin dash and bitcoin cash as well as ethereum and bitcoin. litecoin is in $40 at that time and ethereum is also pretty low at that time so, now waiting for my investment to double atleast and it will in coming days after 30th september.