Vicky Robertson’s Report on digital technology mergers in EU Member States and the UK, commissioned by the European Commission’s Directorate General for Competition, was just published. In the Report, she analyses 97 national merger cases in digital and technology markets from EU Member States and the UK. Against the background of the growing concern about the market power of Big Tech, she identifies theories of harm repeatedly relied upon in the national decisional practice and remedies adopted. This allows her to draw initial conclusions for merger assessment in Europe. While digital ecosystems are increasingly acknowledged in national merger decisions, proper theories of harm on ecosystem envelopment are only being developed.