That depends on how strictly it is applied. Imagine a bank decided to buy iphones for all employees. Or what about all the little electronic devices already in

That depends on how strictly it is applied. Imagine a bank decided to buy iphones for all employees. Or what about all the little electronic devices already in place in a bank building. Locks, fire protection, power control, security circuits, cameras, routers, office computers + accessories, etc. etc. etc. Banks need a LOT of technology. Also consider the consequences of government employees having backdoors into every single part of the banking system, PLUS the public at large (including many techy people) having knowledge that such backdoors exist.