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LONDON — Britain’s competition regulator on Thursday said that Microsoft

and Amazon

are hurting competition in the cloud computing industry and called for a probe into their market dominance under the country’s strict new tech rules.

The Competition and Markets Authority said that market concentration and barriers to entry in the cloud services market have enabled both Microsoft and Amazon to hold “significant unilateral market power” and reap financial gain exceeding the cost of capital expenditure over a sustained period.