Tell HN: BuildZoom posts jobs on HN, but no actual openings available

I see a HN job post from BuildZoom a couple of hours ago. If you click on the link, you will be taken to a job board which says no jobs are available.

https://news.ycombinator.com/item?id=40874189

Just wondering why a company posts a job on HN without having actual openings.

Is it some automated system to post jobs, or are companies using job posts as a marketing tactic?