When Does Candidate Assessment Become Unpaid Labour?

We’ve all heard the stories of job assessments being used as cover for actual work. Where does one draw the line between legitimate ‘skills based’ assessment, where the assessment does have to be as close to real world as possible, and simply ingesting the free labour from maybe hundreds of candidates conducting the assessment? Don’t know the details of this specific case and want to open space for contestation, so have a read and let me know what you think. H/T to brainfooder Charlotte Steggall for the share