I have a friend who is a lawyer. I asked him the question "can a lawyer look into a person's personal finances to see if they're worth suing, or is someone talking poo?"
His responses:
"yeah good luck trying to do that without a private investigator"
"Good luck trying to prove causation"
"If he's worried about some comment hurting his business, he probably can't afford to run a Supreme Court defamation action"