It depends on the laws and regulations of the relevant jurisdictions. If it's not illegal, then it shouldn't be restricted, IMO, but that's ultimately up to the bank in question.
Pragmatically speaking, if both are legal, then both provide a relatively safe return on any investment made; both are very big (and growing) industries, for better or worse.
Pragmatically speaking, if both are legal, then both provide a relatively safe return on any investment made; both are very big (and growing) industries, for better or worse.