For AWS Services, such as EC2, to publish events to your default event-bus, they do not need an IAM role. You get these AWS service events by default on your "default" event-bus - You do not need to do anything to receive them.
Please keep in mind, only AWS Services can do this on your default-event-bus. Other identities (users/roles), or other event-bus destinations require authentication to call the "PutEvents" EventBridge API.
Hope this helps!
Got it, thanks
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