I imaging the lack of regulations appeals to many of the professionals. At least in the US, once licensed, one needs to adhere to an assortment of rules the average person does not. Even when opening up an account, professionals are barred from certain types of accounts.

Crypto is basically unregulated and one can trade as he or she sees fit. Even a pro is on the same level as everyone else from a regulatory standpoint. This is not the case in the equities markets.