The core question revolves around whether Instagram notifies users when a direct message is unsent. Currently, Instagram does not alert the recipient when a message has been removed by the sender. The message simply disappears from the chat history for both parties.
This feature offers a degree of privacy and control over communication on the platform. It allows users to correct mistakes, retract potentially harmful statements, or remove content they no longer wish to be visible. The lack of notification provides a clean slate, preventing unnecessary speculation or conflict that might arise from acknowledging a deleted message.