It's how they lure you in.
I believe it's called "BAIT and switch."
The Big Bang Theory Season 4, Episode 3
using a bull's head for BAIT.
Vikings Season 1, Episode 2
Cinnamon is chick BAIT.
The Big Bang Theory Season 12, Episode 23
One of us has an anxiety attack
and you only think that you're a BAIT.
Money Heist Season 1, Episode 4
We're BAIT. They're using us as BAIT.
Money Heist Season 1, Episode 4