The Gamification of saving lives! f k yeah! - "I AM LEVEL 3, yesssssss." (3-lives saved)
On the other hand, the blood donation text message is connecting the person to the goal they already had: to help others. It makes the satisfaction of this pre-existing goal more salient and unambiguous. I think it's a lot like the theory behind clicker training for animals.
https://www.aspca.org/pet-care/virtual-pet-behaviorist/click...