People are increasingly competing for that Monaco real estate (or realistically, Paris suburbs), whereas a lot of land which had agricultural communities thriving as soon as 50 years ago is now worthless and abandoned. Nobody needs the fruit of your small scale farming in a subpar productivity area. A lot of towns which had thriving industries are also dying out. Even if there's a demand for industry, it's much easier to conjure a brand new metal sheet box in the vicinity of a megapolis and fuel it by exploiting (often illegal) migrant labour.
Magadan is an extreme example but there are a lot of such settlements not only in Russia and Eastern Europe, but also in USA and Western Europe.