Considering the human race bootstrapped itself from nothing, what’s your mental model here? Where did everything come from?
Nature.
Humans and AIs both evolve as the result of some iterations dying. In both cases, we tacitly erase the ones who don't make it (by framing the discussion around the successful, alive ones). The difference is that humans have had a broader training set.
Remembering the outcomes of accidents and remixing those memories to produce derivative works.