The thing that is not scarce from the recruiters' view is applicants or maybe even resumes. This is because anyone looking for a job can easily, due to the magic of the internet, apply at dozens or even hundreds of jobs. And applicants don't even have to apply for jobs any more. If you're on LinkedIn, they can come looking for you, and again, due to the magic of the internet, there are plenty of possible people to consider for a job.
So instead of artificial scarcity we have artificial abundance.
This problem seems to be analogous to the online dating problem. Technology has made one part of the problem far too easy and this causes big problems in other parts of the pipeline.