More of a threat than anything else.

I dont think Zillow is a threat.

However, this hasn't exactly kept STR investors from thriving there without any apparent threat by city government.

Threats to call the police, Immigration work well. 

Don't be intimidated by his idle threats or fear that he will enlist the aid of his parents.4.

Google Dangerous or threating dogs.

Threats are likely not going to work with a person like this.

There’s a book by Gavin de Becker “The gift of Fear” that has some good advice on dealing with people who make threats of any type.  

This time, the HOA's letter and threat to start issuing daily fines sounds severe enough.

Then you get a foreign trust account with a bridge trust and when the trigger is engaged by a pre-established threat then the domestic trust moves all assets into the Cook island trust which does not recognize US courts or judgments.