In the case of mail fraud, there is a The bona fide case of crime be committed and authorities is committed to bring the person(s) to justice.
In the case of these trolls, 1. there is no bona fide case of a crime commit, at most this is a civil matter. 2. they are not committed to bring the person(s) to justice/court, they just want money, they don't care if yo are actually guilty or not.
