Experience: 

 Currently, if you move within the EU, you're expected to switch to your new country's App Store but, in the process, you may lose access to previously purchased apps. Without regular access to updates, applications (especially mobile applications) rapidly become stale and can ultimately break, due to incompatibilities with later versions of internet-hosted services that are doing the "heavy lifting". I've recently encountered both these problems on iTunes and also hit an issue whereby my previous purchase history was lost when switching from the UK App Store to the NL App Store. 

Ideas: 

I appreciate that some applications may not work due to other IP-geotagging restrictions, but I can't see why such restrictions should include not being able to access or update an application that was previously purchased.

I also appreciate that operating a pan-EU store might be problematic. However, it would be useful if the digital single market included online app stores such as iTunes and Google Play. Irrespective of the geographic location that they were purchased, a purchased application has a single owner. If the owner moves country (which is becoming more and more common within the EU), the purchased applications should follow their owner, and not disappear into /dev/null. The complete loss of purchase history when moving iTunes stores is particularly irritating, given that Apple make much over their "iTunes-in-the-cloud" support.