Sure it's different. But first of all, leaving a country isn't actually that difficult, depending a bit on where you live, of course (within the EU it's outright trivial, for example, you just move to another country, no different than if you were to move within a country), and secondly, part of the problem with network effects is that they tend to only make it harder over time to avoid the network. Also, the social cost is actually pretty similar.