Comment by Retric
> They aren't doing it with the intent to damage his business.
That’s arguable. They sent him an email concerned about the harm of disclosure with the upcoming auction. They then apparently got offended by the offer of money to sign an NDA which calls their future motives into question as they now had a beef with the guy.
Saying the actions themselves were not improper is also a defense, and could be perfectly viable even if they had beef with the guy.
"To be improper, interference must be wrongful by some measure beyond the fact of the interference itself, such as a statute, regulation, recognized rule of common law, or an established standard of trade or profession."
They don't need a defense: nobody has yet stated a claim!