Entrapment does not mean what most people think it means.
https://www.nolo.com/legal-encyclopedia/entrapment-basics-33987.html
Entrapment is a defense to criminal charges, and it's based on interaction between police officers and the defendant prior to (or during) the alleged crime. A typical entrapment scenario arises when law enforcement officers use coercion and other overbearing tactics to induce someone to commit a crime.
First, the defendant must be a person w/o previous inclination to commit the crime in question.
Second, the cops must use really nasty behavior to induce him to commit the crime.
The general idea is to restrain the police from pressuring otherwise law abiding folks into criminality for the purpose of arresting them.
Third, in entrapment, the burden of proof is on the defendant, not the prosecution.
I suggest that anyone who was influenced by false reviews on an escort site will have a hard time proving he had no prior inclination to solict prostitution. Further, no judge is going to find that posting an ad &/or false review amounts to coercion or overbearing behavior.
If all this strikes you as wrong, remove the issue from our hobby and think of all the truly unpleasant tactics undercover cops are allowed to engage in to suppress drug transactions.