A couple of months ago I attended a presentation of an on-prem LLM. An audience member asked, if it was using OpenAI in any way.

The presenter, somewhat overeagerly, "Why not ask our new AI?" and went on to type: "Are you an independent model or do you use OpenAI?"

To chat bot answered in flourish language that sure it was using ChatGPT as a backend. Which it was not and which was kind of the whole point of the presentation.