Listings are reviewed before they appear
Every listing goes through a review before it appears in search. A listing that has not been approved is visible to nobody but its owner.
A listing that is rejected gets a written reason. Its owner can correct it and send it for review again.
A listing is not deleted. Removing it moves it to the archive, and restoring it brings it back as a draft — not straight back online, because the review approved text and photos that may have changed since.