Why not notify faculty candidates of the position being filled?
This may just be a matter of timing. Such letters to failed candidates wouldn't normally be sent until there was a signed contract with the accepted person. I can't guarantee that it is universal practice to notify failed candidates, but suspect that it is the general practice. 

On the other hand, the other applicants would be foolish to turn down other offers without positive assurance of success unless they are willing to risk the consequences. They have been free to ask about their status, of course. 

But "acceptance" of an offer also requires certain bureaucratic procedures be completed and they take a bit of time. A week isn't enough in many cases.