Arwin Im not sure you are talking about the same thing here,
Binance sells Down tokens and up tokens, if you buy a down token and the market crashes , that token gives you profit, the same way if you short bitcoin and it crashes, the short position gives you profit.
I shorted the market , and Eth crashed and instead of my short paying me out +80% Binance paid me out -90%
take a look here if you do not understand
https://www.reddit.com/r/binance/comments/ngtlei/how_is_it_possible_ethup_and_ethdown_80_binance/