Money sitting in a bank account is fine. It's not using any real resources sitting there. Of course, he might spend it sooner or later, which would probably b

Money sitting in a bank account is fine. It's not using any real resources sitting there. Of course, he might spend it sooner or later, which would probably be bad for everyone except him. So even better (for everyone but him) would be if he converted the money to paper bills, and then burned them all. That would benefit millions of people. (Exactly who would depend on which country's currency the bills were in.)