To play devil's advocate: If people are moving around to competitors, information will leak, intentionally or not, in small doses or large. You can call that

To play devil's advocate: If people are moving around to competitors, information will leak, intentionally or not, in small doses or large. You can call that a feature or a bug. If you call it a bug, then you'll try to prevent people from moving, because when they do, it's too late.