> A programmer can read available but not oss licensed code and learn from it. Thats fair use. If a machine does it, is it wrong ?

You can learn from it, but if you start copying snippets or base your code on it to such an extent that its clear your work is based on it, things start to get risky.

For comparison, people have tried to get around copyright of photos by hiring an illustrator to "draw" the photo, which doesn't work legally. This situation seems similar.