If a company get get 500 candidates to each spend an hour on a task, for 500 unpaid person-hours of work, to save themselves single-digit paid hours weeding thr

If a company get get 500 candidates to each spend an hour on a task, for 500 unpaid person-hours of work, to save themselves single-digit paid hours weeding through applications to narrow them down, seems like it's very bad in an absolute what's-best-for-society sense, but quite a deal for the company.