To be honest i think this was a good move by NYSE, From what i have my understood in bitcoin futures is that you will be paying say an X amount of money in advance. Like if you have predicted that bitcoin in a month or two will be at 30K USD, you will paid in advance but for a lower amount maybe 25K USD and now you are on a contract. If in a month or two it did not reach the 30K mark then good for you but if it exceeds it i guess that is bad since you were only paid 25K, with this being said and judging on how volatile the market is they will be at a loss.