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AWS initially participated but was finalizing the Event Bridge format specification at a time when CloudEvents was not ready to go 1.0.

[edit: more simply MS & GCP said were insufficiently flexible for the Gorilla and AWS wasn't willing to delay shipping]

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[I’m a PM on EventBridge] This is correct. Tim Bray, who built CloudWatch Events (which later became Amazon EventBridge) participated in the early CloudEvents spec, but as Erik said, CloudWatch Events launched before CloudEvents spec was finalized.

From the EventBridge perspective, we like CloudEvents and I expect that in future we will look to add support for it as an alternative to our existing envelope.

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