“…Offering incentives (e.g., cash bonuses, discounts, coupons) to consumers are effective ways for online platforms to acquire new users, increase user engagement, and boost platform revenue [2,3,9,20,21,32,37,38,40,41]. For example, coupons in Taobao [37] are offered to increase user activity, promotions in Booking [9] can improve user satisfaction, cash bonuses in Kuaishou [2] are used to stimulate user retention, and promotions in Uber [40] can encourage users to start using a new product.…”