AirBnB (and similar) has been really bad for the property market in the Scottish Highlands. Lots of people buying up scarce housing stock to use for holiday lets, means that locals who work in the area (where a lot of local employers can't pay stellar rates) can't afford to buy.

Combine that with the fact that these areas are often in National Parks which have restrictions on new-builds and you'll inevitably reduce the amount of people actually living in the area.