Even after I applied with my resume and portfolio, and had the introductory interview, they asked me to write another sample that they could review.
This one I actually decided to do because they agreed it could be a short guide. So, I wrote a short user guide that took me maybe 30 minutes. However, I didn’t end up getting the job — and that time spent could be considered wasted. One way that work can go unwasted is if I add it to my portfolio. That practice can also be considered skill-building.
But still, unpaid labor is wrong. WRONG.
Source: https://www.buzzfeed.com/daniellaflores/handling-free-work-requests-job-interviews