The applicant likely will never know why they were rejected. How long would it take for someone to realize they could assassinate the character of a rival or so

The applicant likely will never know why they were rejected. How long would it take for someone to realize they could assassinate the character of a rival or someone they simply didn't like by posting with a fake account in places the AI is likely the source input? The target might never know that the false posts exists while being silently passed over.