It's just individual company not being incentivized to pull down job listings when they no longer have capacity to hire.

The roles suddenly become "opportunistic hire" rather than actual open headcount. Open roles exist in a continuum of "urgent backfill" / "open budget headcount this quarter" / "could negotiate headcount for the right candidate" / "just passively interviewing to see who is out there" / "no chance we are hiring anyone this decade".

Not a clear case of fraud to be made really. Better to have no job listing to send resumes to? Not clear thats true either.