The issue I have with this is that humans are not resources like businesses want to think they are. They are living beings with, gasp, memory. If I applied to a job I thought I was a great fit for, got a call with an initial recruiter, only to be ghosted - I'm going to remember that when they call 6-12mo later. By then I'd have already found a new gig with something tangible and have already ramped up on it, I'm no longer in the pool.
Likewise for folks who are employed but looking. They'll keep searching until they land their exit. Again, by then it's too late and they are no longer in the pool.
If you go fishing when the fish aren't biting, you won't catch anything.
If you go fishing when they are, you'll catch as much as you can carry.