Yes, that’s exactly what happens when you buy a book, or pay for a music subscription. The work is in the public domain, then global permission to observe and copy the work is already granted.
> Do you ask for permission when you get new ideas from HN that aren't your own?
You don’t need to. It’s implicitly assumed, by virtue of publishing in a public forum, that the author is providing permission for people read their comments and ideas, and remix them as they wish. That permission doesn’t include exact replication, but reading and understanding is assumed, otherwise why did the author publish it?
> Humans are constantly ingesting gobs of "copyrighted" insights that they eventually remix into their own creations without necessarily reimbursing the original source(s) of their creativity.
Correct. Literally everything produced by a human is automatically copyrighted. But the manner in which work is published creates implicit licenses for the public to consume those works. You publish in public, you automatically grate licenses for the public to consume and transform it.
If a human transforms an idea, it automatically becomes a new idea with its own copyright. The same doesn’t apply to AI because they’re not human, and thus the law generally doesn’t recognise them an having ability to create or transform ideas. If you believe AI can create and transform ideas, then you need lobby for the law to recognise that ability, but right now, only natural humans have that ability according to the law