I am currently staying at one of ICs in Vietnam.
During the check-in process when I was told about the 50USD mini-bar cap, I asked the staff if the price of each item is described in USD, which the person responded is yes saying the description is both in USD and local currency (VND).
The prices, however, are actually only in the local currency that you might know is a bit confusing for travelers not accustomed to VND descriptions (000 digits are omitted).
The mini-bar list also says service charges and taxes will be added to the prices.

My friends, I am not so stupid and yes, I can convert the currency, calculate total prices including taxes etc., but that is a bit bothering
Also confusing is the fact that the property does not charge soft drinks & beers regardless of being an RA or not but the list includes the prices of all items