If this was not a moon-enhancer, but just a sharpener – which we have used on images for decades – would there be any fuss? Probably not. If this was an AI model trained to do better sharpening than the algorithms we've used historically, would there be any fuss? Maybe, but probably less than with this.
Short of literally superimposing fixed images of the moon on top of people's photos, which this is not doing, isn't this just a natural progression of the same sorts of image enhancements we've been doing previously?
Perhaps the issue is in the ML optimisation function? An image sharpener is optimising for a supposedly generic change, whereas this model is optimising for a particular subject that carries semantic meaning for humans. Similarly, an enhancer that improves contrast and sharpening on human faces might be fine, but a model that uses your other photos of your friends and family to improve their faces in new photos may not be, because it has the potential to change meaning if it gets it wrong?