Yes, that's an important thing to worry about. I'm just not sure that "learning from a website's content how to create other intellectual works without explicit permission from the owner to do so" counts as lying, manipulating, or stealing.
That's not fundamentally different from when employers "explicitly refuse" you learning from your job with them to use at the next one. Sure, they certainly want that, but the law doesn't recognize it as a valid constraint (except for e.g. trade secrets and proprietary knowledge).
Look, just have courtesy for others and don't argue in bad faith, the snark included. This community came up with the HN guidelines, let's try to follow them more. That's all I wanted to say. All the best.