I would say it’s worse than that. Like knowing that you are selling exp boosters changes the calculus on how exp is earned. If the game played smoothly, there would be no need to sell the boosters and creating the eco system to support it would have been wasted. A system where certain items are nft based would push for these items to be better then the non nft items both for expectation of value, and to raise the trade value to siphon from. This already happens with games with dlc cosmetics. The gear in the games looks increasingly shit compared to the DLC. And that is a natural consequence of polluting the game space.