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Add-in events are also handled by remote web services, but they are configured differently in the add-in package from list and list item RERs, so they are treated as a separate category of component.
For an add-in event, the remote web service is registered in the add-in manifest, not in an add-in web feature.
Like the App Installed event, it is an after event, but is essentially synchronous, and it is a best practice to catch errors and notify Share Point to roll back the update.
In fact, it is a best practice to catch any errors in your handler and instruct Share Point to roll back the installation.
However, your App Uninstalling handler completes If Share Point doesn't receive a results message from your handler in 30 seconds, it calls the handler again.
It gives up entirely and rolls back the event after three retries (four tries in all).
Because your service sends a cancel message to Share Point, the add-in is not removed from the recycle bin.
If it is restored from there and used again, it may fail to work without that database entry.
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If Share Point encounters an error when processing any of the three add-in events, it cancels the event and rolls back any changes it has made in connection with the event.