Why is the concept of domestic traveler point more difficult to define than that of international traveler

Domestic tourists, for some reason for a certain period of time, temporarily unable to travel abroad, or to remind people who like to travel, for special reasons and special circumstances, domestic tourists do not travel for the time being. Tickets to any attraction in the country are open to all people in the country, all the time. But in addition to special periods, special circumstances, such as the state now expressly provided for attractions, because of the epidemic reasons a place, an attraction, a special period, temporarily can not be opened, or weather reasons, a place, an attraction, due to special weather, and special circumstances, suspended open.