If a street in a city floods forming a river, is that river natural because no human intended to create it? It would not be there without human intervention, though. Are cows born in a farm less natural than the others?
Making a distinction is not only difficult and ambiguous, as the line between “natural” and “artificial” is not always clear, but also serves a base for a naturalistic fallacy.
We humans are animals, part of nature. That makes all we create a manifestation of nature. A monkey using a rock as a tool does not make the rock less natural.
“Artificial” intelligence is intelligence, no matter how we try to discredit it. Every system that perceives stimuli and takes decisions to adapt to them is intelligent.