There is no Europe. It's just not a thing. European countries just work with some common framework that is better than nothing.
It's not even easy to employ people across Europe. You cant as a company in Denmark offer a normal employment contract to someone in Germany. You need a legal entity in both countries. There's also still european xenophobia and racism (ie not hiring someone because of their nationality).
Moving around in Europe sucks as well. Why should you move to country X and learn their language just because of a company/job? It makes no sense. A growing company in Berlin does not benefit anyone in Warsaw. There's no synergies.
It's not even easy to employ people across Europe. You cant as a company in Denmark offer a normal employment contract to someone in Germany. You need a legal entity in both countries. There's also still european xenophobia and racism (ie not hiring someone because of their nationality).
Moving around in Europe sucks as well. Why should you move to country X and learn their language just because of a company/job? It makes no sense. A growing company in Berlin does not benefit anyone in Warsaw. There's no synergies.