US-based but I've been bribed multiple times to get a gift card in exchange for changing my review to 5 stars. Usually I change the review, take the gift card,

US-based but I've been bribed multiple times to get a gift card in exchange for changing my review to 5 stars. Usually I change the review, take the gift card, and then change it back to fewer stars indicating that seller bribed me. It's the only way I can think of that actually financially discourages the practice.