>>4231502because its AI...
these AI programs are nothing but a huge databse aka. a pool of billions of other images, while going off a code that allows them to fill in or create or whatever, based on that pool of billions of images. the AI in this case just scrolled through thousands of images similar to your BW photo, which were obviously paintings and then colored your photo as best as it can, which is as a painting.
AI is not like a human brain, it cant create something new, it cant think of a new concept out of nothing or be creative with no baseline.
if you delete the entire database of photos of that AI and put only 1 cat photo and 1 car photo and then uploaded the same BW photo and told the AI to color it the best it can, it would probably have cat hair colors and car paint colors all over.
