If an European bank asks another bank here in Guatemala, they will not give any information at all. The only way a Guatemalan Bank will give an European bank information is if it is order by a Guatemalan court order. The European bank will have to start a legal process in order to get access to the bank account.
About gambling, there are restrictions, you cannot open a corporation for gambling, even thought we do have a lots of casinos, but they work as a charity foundations, it is a bit complicate to get a gambling license and it is very expensive. About pharmacy and adult business, there is any restrictions at all.