Inconsistency in European policy
Eurocrats have banned "grey market goods" or goods that sell lower in one market being exported to another. I believe levi jeans were the classic case back in the 90's.
In the 2000's they have moved on to services but with a reverse policy stance "we all should pay the same" with mobile phone providers the poster child for bad practice.
Any other bureaucracy would be embarrassed by the double standard.