I think it was from their own pocket Binance is a big company and they already have many services offer they are making money on trading fees, coins and token listing, mining fees, and other services.
So even with the market crash, I think they could still afford and pay those who win on the futures trading.
Yes friend, They are paying their own pocket when getting market crash. If members making profit from Sell/Shot, Binance spending money from their own pocket. But it is not good for Binance Company. No loss from margin trading, Spot Trading, Futures Buy/Long trading. But Sell/Short is a big loss of Binance company. I dont know why they are doing this foolishness .... Sell/Shot is not good for Binance Company..