The problem to be solved, imo, is ghost listings. - I don’t care if a company ghosts me because they hired someone else - I care if I spend time filling out applications for jobs that don’t exist
I’m not sure how to make participation by the employer tractable. They can’t exactly be mandated to hire, can they? Unless I’m trapped in a prison of the mind that seems like too risky of a proposition for them.
That said, as a candidate I would happily pay $USD/month for access to a job board where I know that the job as posted is definitely for real and definitely getting filled in a certain timeframe. I don’t care if my particular resume gets read, or replied to. I only care that the phenomena of “ghost job” is nonexistent in the walled-garden that I’m paying for access to.