Loss aversion beats ambition
A race asks who will get there first. It is a fine question, but it is answered by whoever is ahead, and a viewer who can see the leader can predict the ending. The emotional register is hope, and hope is easy to abandon halfway.
A rising hazard asks who will still be here. There is no way to get ahead, only to not be taken, and the viewer’s attention is fixed on a threat rather than on a goal. People are considerably more attentive to something bad approaching a thing they have chosen than to that thing making progress.
This is why the mode shares none of the race machinery. There is no finish line, no leaderboard and no standings, because all of them would invite the viewer to read the run as a competition with a predictable winner instead of as a survival situation with an unpredictable one.

