The Brax arrest implies that a legal partner of an EU citizen has the right to stay with the EU citizen in a 3rd EU country, that means, the partner can live and work in that country. For some countries this implies that it's better not to be in your own country. For example, the Netherlands is quite restrictive when it comes to accepting partners of their citizens. Even if the couple has children together, the state claims that there's no need for both parents to raise the children in the Netherlands. Because of this many Dutch people have moved to 3rd countries, Belgium is the easiest because Dutch legal documents are accepted right away. Vice versa Belgian people have moved to the Netherlands or France.
The Brax arrest makes it easier to get around restrictions.
- Information in Dutch: http://vreemdelingenrechtcom.blogspot.be/2011/01/vreemdelingenbewaring-en-het-brax.html