I thought about it and one of the things that makes all the AI songs with vocals stand out so far is the way their vocals sound. It's hard to explain but it lacks depth in the same way your voice does when you sing into a tabletop fan, it kind of cuts the range of frequencies and sounds very airy. If youve ever driven (or been in) a naturally aspirated car, maybe you know the noise I am thinking about
Plus the incredibly poorly autotuned vocals, noticable in the first sentence "Why train" which sounds crackling and grating or in the chorus