AltStore is an alternative app store that allows EU users to install apps from different sources. It is opensource.
The privacy policy indicates it’s main office is in the US
AltStore, LLC.
4130 BOWSER AVE.
DALLAS, TX 75219
UNITED STATES
However, I consider it to be a good first step away from the AppStore because it’s opensource. Others are very welcome to suggest real EU alternative app store for the iPhone.
I think if you VPN into EU you can become an EU user in one way or another, but you may have to do it consistently.