Perhaps it's just me or maybe just the ones I'm dealing with. But not one recruiter I've ever dealt with at Cisco nor hiring managers shows any dececency at all during the process.
Why ghost when you can spend about 5 seconds sending even a form letter informing people that they didn't get a job? Just disappearing and ignoring requests for updates is unprofessional and disrespectful.
I can understand not going into specific details if there is some concern about litigation, but a complete ghost is just sad.