Apart from helping coding (with problems) and creating great images there is no major use case. AI hasn't yet produced a single new idea or discovery, let alone a world changing one. It most certainly is a fad. Its best use case is for grifting, trickery, manipulation of peoples minds, producing guff websites, manipulative advertising, and best of for spying on the public. There is currently only one actually good one: its fun to play with, like a toy, but it gets boring quick, because it is incapable of doing any new tricks. This is exactly what happened with Alexa/Siri its just the same gimmick, but a little bit better , sometimes.