Why would gamification be a misleading practice per se?
Obviously the term has nothing to with "gaming the system", which is an expression that essnetially means cheating.
You can go to a casino and play roulette or slots without being misled or cheated. That being the case you can definitely gamify shopping without misleading or cheating customers. If that's the case then people are adults and make their own decisions.
I don't think any sane consumer wants gamification. Can you give an example of why a consumer would want it (other than by being coerced into it by the seller)?
Temu is doing this because they gain from it. So if this were legal, then other sellers might be forced to do it too to remain competitive. Is this really a direction you want to go in?
If so, I'm curious why you think that any consumer wants the system to be gamed? And why freedom to game the system should be a right.