LONDON :The dominant position of Amazon and Microsoft in cloud computing is harming competition, with their impact exacerbated by technical and commercial barriers to switching, an inquiry group from Britain's antitrust regulator said. The Competition and Markets Authority (CMA) inquiry group said on Thursday the regulator should investigate whether to designate the two with strategic market status (SMS) in cloud services, which would give it new powers to intervene. It noted, however, that the