You misunderstand how this works. They do not train it on Wikipedia. The Wikipedia article is part of the prompt. You can do this yourself by copy-pasting a Wik

You misunderstand how this works. They do not train it on Wikipedia. The Wikipedia article is part of the prompt. You can do this yourself by copy-pasting a Wikipedia article into ChatGPT and ask a question about it. The underlying LLM is still GPT-3 and trained on everything on internet.