"When interviewing for a UX design position, be prepared to speak to your design process, preferences, and project experience. Employers are looking for candidates that can adapt their company's brand aesthetic in a way that provides a satisfying experience for their users. Be ready to answer questions about your ability to work closely with engineers and project managers as well as your knowledge of graphic design programs, web development, and user interface design."
The challenge was very different from the job description and interview questions
I answered honestly, and did not expect my work to be implemented for free.
Weird, I interview a while back and the same thing happened to me except it was for a different project but still related to the site. Really shady. Wouldn't trust a company like that.