Obviously, the ones who do better at it are the ones we cannot detect.
It is not so much that they cannot be detected, after all their editing has purpose and they are usually both aggressive and persistent. However, adequate demonstration of such patterns of activity to other administrators, or ultimately, to a committee is not trivial.
The essential clue is that they have a strong point of view about something that no ordinary person would be exercised about, some company or product with public relations deficits.
Ultimately, pursuit of any but the most clumsy is hard thankless work. Beating on the clumsy, is, of course, a necessary task if only to correct bad editing.
Fred