The loser signs up for a gig delivery app and completes five deliveries in a league-chosen costume, with customer reactions logged. Ratings must stay above four stars, which is harder in a chicken suit. Earnings, naturally, go to the champion.
Budget note: this one costs nothing but dignity, which makes it a strong pick for leagues that would rather spend the pot on the champion than on the loser's downfall.
Seen in the wild: fantasypunishments.com