@ErikJonker "Legitimate interest" is their favorite catch-all phrase. The Austrian credit rating company Kreditschutzverband has a full history of all addresses I have ever lived at (at least those in Austria). When I asked them to delete it, their lawyers sent me a letter stating that they have legitimate interest. #ksv1870
In fact, I thought this had been ruled illegal already (https://noyb.eu/de/gewonnen-grossteil-der-datenbank-von-kreditauskunftei-crif-illegal) thanks to @noybeu , but apparently the Kreditschutzverband disagrees.