First off, the company's representative here is wildly unprofessional. You cannot be that hostile when representing your organization, even in the face of such

First off, the company's representative here is wildly unprofessional. You cannot be that hostile when representing your organization, even in the face of such a hostile post. That said I actually don't necessarily disagree with his initial point. Exploitative would be if they were having candidates do work that would be used by the company. I don't think there is anything wrong with asking people to do a demanding challenge as part of an interview, provided you are willing to accept the candidate loss you will get from people who refuse to do it.