I understand now, they actually don't care whether they have inventory or not, they just take the money and collect fees.

If the price surges and they have inventory, they say there's no stock and tell others to sell it themselves; if they don't have stock, they say there's no stock, and they don't lose anything anyway.
When it crashes, they send out the inventory to everyone and still collect fees, and everyone will just blame Musk.
Who cares if they have jujubes or not, they make a few moves first, does the crypto circle have any memory?
Now everyone curses a few words, and in a few days, they forget again.