Request for Deletion workflow triggered on content deletion
When a user login and delete a page or asset in AEM, the "Request for Deletion" workflow is triggered.
AEM 6.0 and later versions
This is by design.
If the user doesn't have replication privileges under a path and try to delete content under that path, it triggers the Request for Deletion workflow. If you would like the user to be able to delete the content under a certain path, then allow them replication privilege on the path.