Usage patterns
〈動物〉の餌食になるto become prey to an animal
The small fish became prey to the larger fish.
〈事〉の餌食になるto fall victim to something (a scam, crime, etc.)
He ended up falling victim to a scam.
〈人〉を餌食にするto prey on someone / exploit someone as a victim
The unscrupulous businesses prey on elderly people.