Simply refer to the sources you used

Source: The Internet.

Most things are duplicated thousands of times on the Internet. So stating sources would very quickly become a bigger text than almost any answer from an AI.

But even disregarding that, as an example: Stating that you scraped republican and democrat home sites on a general publicly available site documenting the AI, does not explain which if any was used for answering a political question.

Your proposal sounds simple, but is probably extremely hard to implement in a useful way.