There's two sides to this. Companies need to be able to make sure they're able to locate (and not miss) viable candidates. But job-seekers need to know there's a legitimate company and an actual job. There are many job scams out there, especially for entry level, low-skill jobs.

In my early days, I once went through three interviews for a small "start up." On the third round, the founder admitted he couldn't pay me in anything but "equity" even though I specifically asked about funding and compensation on the first interview. (I got a very early "Craigs List" to pull the job listing--with an personal reply from Craig Newmark--and the "employer" settled with me for several thousand after I sent a demand letter and filed a claim in Santa Clara County small claims court for fraud.)