This only means that there are many players in their platform that prefers bitcoin cashouts because of the recent rally of bitcoin price, maybe they are hoping that their money will increase after they receive their cashouts.
But I am pretty impress that their volume is pretty huge, $100 million a month is quite huge knowing that it is only 60% of it's transaction. But I am pretty sure that this cashouts are now declining because the bitcoin price is starting to decrease now from $19k to almost $16k as of this moment.