Amazon’s AWS and Microsoft Azure Face EU Probe Into Cloud Power

Amazon Web Services and Microsoft Corp.’s Azure are under investigation by the European Union to determine whether the world’s two biggest cloud platforms should be hit by rules designed to curtail Big Tech’s market power.

The European Commission said Tuesday the pair “occupy very strong positions” and that it will assess “whether they act as important gateways between businesses and consumers” under the Digital Markets Act. It said it will also check whether the rulebook aimed at reining in anticompetitive behavior is “effective in addressing practices that limit competitiveness or are unfair in the cloud sector.”

The EU’s move ...