New accounts will not be able to post certain domains and possibly also apex domains to avoid spam. If there is a specific URL / story / blog on that domain people may find interesting then submit that URL. It may still get automatically [dead] if the domain is either known to be spam, commercial solicitation, or otherwise problematic. Take a moment to read through the guidelines [1] and FAQ listed at the bottom of the page. There are many factors that determine if something is automatically [dead], most of which would not be disclosed or spammers will game them.
For example, the apex domain you submitted is a commercial service (advertisement) for an AI business solution and would be considered spam.
[1] - https://news.ycombinator.com/newsguidelines.html