““There is not one reason for moving, but a multitude of paper cuts, most of which have been triggered or amplified by Brexit,” Guillaume Rischard, the organisation’s treasurer, told members of the foundation in an email sent earlier this month.”
Maps are facts, so copyright barely covers them. They were protected by EU database rights, and the UK and EU never agreed to recognize each other’s after Brexit. OpenStreetMap was founded in Britain and may now leave it. Brexit promised freedom from EU rules, and here is a British open data project moving to the EU to get them back.