Six years ago Amazon’s Jeff Bezos offered some blunt advice to panicking competitors. Complaining is not a strategy, he said. But since then the chorus of critics has only got louder. As the online retail company turns 25, it deservedly finds itself in the sights of antitrust regulators.

On Friday Britain’s competition authority said it wanted to examine Amazon’s investment in food delivery company Deliveroo. It was right to do so, even though it was a minority stake and Amazon’s previous effort to build a food delivery service had failed. Amazon could push its advantage simply by, say, offering free delivery to its Prime members.

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