Sell access to Chatbot with custom knowledge base?

Is there money to be made in creating a robust knowledge base, overlaying ChatGPT/LLM, and selling access to the resultant chatbot? I’m not talking about actually “training” the LLM, but instead using the many tools/processes to chunk data, create embeddings, and storing in a vector database to then use semantic search to allow an LLM to directly access the custom knowledge base? I can think of a few examples where a chatbot with access to a deep knowledge base with current/updated info might provide immense value to potential clients. I have seen all the fanfare about using this or similar methods to create “customer service” chatbots, or the rush for companies/organizations to develop internal AI assistants, but what about opportunities to sell retail access to custom-knowledge chatbots?