When a company opens a role, it goes into their applicant tracking system: Greenhouse, Lever, Ashby, Workday, SmartRecruiters, and a long tail of others. That system publishes a feed. We read those feeds, thousands of them, and refresh every 12 hours.
That has two consequences. The first is that you see roles the day they open, often before they reach the big aggregators. The second is that a large share of what is here never reaches those aggregators at all, because nobody paid to syndicate it.
It also means the listing you click is the employer's own posting. You apply on their site, in their system, with no middle layer taking a cut or holding your application.

Refreshed every 12 hours
Roles appear within half a day of the employer posting them.
Closed roles get culled
A posting that stops appearing in its source feed is closed after four days and deleted three days later.
Nobody can buy a spot
There is no sponsored placement and no way for an employer to pay for rank.
Free. Searching, filtering, reading listings, and saving them costs nothing and does not use credits.
Full documentation, including the limits