Thought experiment:

Lets say everyone(or just the people who are in GME) decided to liquidate their holding on RH now, ie. they are fed up with that exchange for various reasons. From what I understand they would not be able to pay out funds to sellers? If so this would create a 1920's style run on their exchange that could spill over into other exchanges? I am genuinely curious as it would behoove RH to let people keep buying vs. sell only.