I’ll be damned if I understand what ‘partial nationalization’ means. When something becomes nationalized, owned by the nation, it ceases to be a business, it becomes a service. Partial nationalization implies (definitely) that it’s still a business.
Sure, a government can charge a fee for the service, but the profit motive? The bank owned by John Q Citizen will try to extract as much dough from John Q Citizen as market will bear – on behalf of John Q Citizen? Weird.