I think what puts escorts off the review system is not so much bad reviews as unfair reviews. Pretty much anyone can register and write a review. If the review is malicious or fake then the escort can write a reply, but the damage is already done. But I'm sure that opting out is bad for business. I've never seen an escort who didn't allow reviews, although I've seen and had a very good time time with escorts who had one or more bad reviews.