I honestly think at least 50% of the blame for ghost jobs in on HR. Ghosts jobs are great if you're an HR person trying to not get laid off. You get to look busy all the time, sending emails that don't matter. I think HR people are the masters of looking busy. It of course also makes the company itself look better, like they're still hiring all the time when they aren't. It also benefits the hiring manager to have ghost jobs, because it makes the current team feel more replaceable