Why is the old iced coffee not hot?

In the well-known instant coffee giants such as Nestle and Maxwell, most of their instant coffee is planted in Southeast Asian countries such as Laos and Viet Nam. Among the coffees grown in Laos, there may be Arabica coffee in recent years, but it is estimated that the flavor is average, so it has not been paid attention to by everyone.

To make old iced coffee, you can pour coffee into a milk cup with ice cubes, and mix and stir to get a cup of old iced coffee.