Geography is a factor for interpreting markets. If there are vast distances between cities and regions, or a lot of remote villages, it will be harder to get interpreters to assignments. This could on the other hand be a driver for remote interpreting. It also matters if a country has certain interpreting hubs, like for example in Belgium where the market centres around Brussels. These hubs then dominate the market and set rates and standards.
The technological infrastructure also plays a big role. How solid the internet connection in public places and remote regions is, can either be a driver or a blocker for remote solutions.