It doesnt have to be useful to you and it does not have to replace every job, it just has to show revenue and rapid growth. There are lots and lots of tasks out there were management doesnt really care if its perfect as long as its cheap and it gets done. AI will automate that stuff first, but people in rich countries probably wont notice because that sort of work was outsourced years ago. In the meantime, its all going to be about efficiency, having fewer people do the same work with AI assistance.