Becoming a bank brings a whole stack of regulations that most companies would rather avoid like the plague. It's not glass-stegall level of forced separation a

Becoming a bank brings a whole stack of regulations that most companies would rather avoid like the plague. It's not glass-stegall level of forced separation anymore, but it's still more onerous than is probably worth it for Apple. But it's possible. You do see it sometimes, e.g. car companies (also worth noting though, most of those have been spun off).