Shame because they're good registrars. I wonder why the European requirement though (since the TLDs themselves are ultimately governed by the registries and you can always use your own - or third party, EU based - name servers).
Because of GDPR, it’s so much simpler so have a host within the EU than elsewhere and especially simpler than having one in the US
Not sure I understand why GDPR has anything to do with domain _registration_ (not hosting).