Assuming a world where there is a set of employers that would actually like to hire someone and a set of workers who are desiring employment, the set of listings that are not seeking to hire (or are only floating a job listing in perpetuity on the off-chance that some overqualified sap will take up their offer for less than they would expect in the market) encourage bad behavior from the other two parties.
It becomes substantially more difficult to parse through a pile of job listings to find what is a real (or realistic) listing and encourage the "shotgun approach" for applicants.
The flood of competing fake listings and the resultant tidal wave of shotgunned-resumes requires employers to spend more time cross-posting openings to reach real applicants and sorting through a greater number of low-effort bad-fit applications
Mild legislation that requires expected hiring dates and requires employers to say if they are just collecting resumes or face fines does not totally fix the issue but it is a welcome change in the right direction.