I wouldn't say niche, there are hundreds of use cases. I believe we have just scratched the surface of possibilities yet. I think you could say, in every situation you would ask a human a question you could also ask a chatbot.
For me searching is garbage, because I get 10+ search results returned in often a random order based on key words.
A FAQ with 5000 topics is enormous, and a typical search interface is a bad user experience for finding the answer for your question.
A chatbot, which is properly implemented and that cover the exact intent you are asking will return one answer, with maybe a few follow-up questions. Fast precise and natural, this is what people want.