The sum of all this becomes my "experience of life", and I can draw upon that knowledge to create new stuff.

The only difference between an AI and me is speed and capability to remember.

So ... does the act of reading HN become theft just because it is done by a non-human, with inhuman efficiency?

Personally I don't think so.

We could continue the conversation with a debate about whether or not the AI's outputs (creations) should be restricted (legally) in the same way as a human...