tip baiting

Etymology
From. Popularised during the 2020s with the rise of services because of the COVID-19 pandemic, but attested slightly earlier (see quotations below).

Noun

 * 1)  In fast food delivery, the practice of promising a large tip (usually on a delivery app) so that the deliverer feels incentivised to swiftly reach their destination, only to deliberately decrease or cancel the tip once the delivery is completed.