"What's the rationale behind that, in this day and age? Are you a money launderer or something?"
I wish I have the money to launder! I moved to Vietnam to work in '94 and Vietnam then and, to a certain extent, to this day is a cash society. Even foreign banks didn't offer credit cards. I only got a debit card at the ANZ 2 years ago. I'm like 15 years behind the times