I have no doubt that the majority of LLM models have trained on Wikipedia articles

Yes. If you check the other top Google results you'll frequently find the articles they plagiarized.

I do have a custom instruction to use Wikipedia as a source where possible.

The difference is i dont need to know what i am looking for i can just ask some a basic question.

Llms are limited and for that reason vey hated on lemmy but they can be very useful when configured right.