An escrow service is about protecting the interest of both parties using the service. But there are some situations where there would appear to be irreconcilable differences that can not be resolved under the law to both party's satisfaction. One of those situations is the sale of what turn out to be counterfeit goods.
Escrow services typically require the buyer to return the item to get a refund. Under US law mailing counterfeit goods is a crime in either direction, even as a return. I don't know if other means of shipping is illegal or not. I haven't found any info on that.
So in the situation that the goods turn out to be counterfeit, should an escrow service require the return of the counterfeit goods? If that is indeed illegal, would that not make the entire deal an unenforceable contract? Seems a very murky area.