You're conflating two issues: "Unpaid overtime, unpaid internships" with "unpaid working interviews". OT and internships are post acceptance of a work offer. I

You're conflating two issues: "Unpaid overtime, unpaid internships" with "unpaid working interviews". OT and internships are post acceptance of a work offer. Interviews should be used by the individual to find the best fit for themselves. If you think spending 10-20 hours making sure your top choice really is where you want to spend the next several thousand hours of your work life is "free work" I think you misunderstand the value that the individual gets out of the diligence.