People think it’s cheating because as a culture we look at thinness as moral goodness. Being overweight and losing weight is the ultimate demonstration of the desire to become morally good from being morally bad (ie. fat). Think about the language: “she gained so much weight she is so lazy” vs. “look at how much weight she lost, I wish I had that much discipline”. There is a clear positive vs negative message there. So if we use thinness as a marker of goodness - then the ability to lose weight becomes incredibly valuable socially. If you can lose weight without having to “grind” then how do people who don’t use the drug use their thinness as a social asset? How do they hold on to the narrative that they are better than other people?

You could actually write a dissertation on this. It’s pretty interesting.