I've seen this as a strategy for H1B fraud, months after accepting applications everyone good is probably employed somewhere, so suddenly we've recently discovered there are no qualified local applicants for the job position H1B stamped approved.

If you want to make the HR person extremely angry then feign interest and you've ruined their whole H1B process. Its kinda funny to do. Sometimes they'll slam the phone down or sound like they're about to cry. If they're made of sterner stuff you'll get requirements like an in person interview at 4am or an interview within the hour in person (for a job 100 miles away).