@Linebyline Its not how copyright works (Part two of.the post). As you say it is default-deny in its core. This does not change with a Tag that explicitly states NO[Whatever]. You ALWAYS retain the rights to your UNLESS you explicitly allow usage. Thats ultimately the spirit of the law.
The addage of a line that says "No one can use this for anything, but fuck AI in general" does not change that nor makes it anything default-allow. You cannot assume that in copyright. Never. When you are in doubt over if you can use something or not. The answer will lean to "no". Everything else will end very badly for you.
Technically even Public Domain is only a license and you retain some form of copyright. you just grant a very very permissive license.
You actually got it right with the first part.
I know I am generalizing here but its the spirit of the law, pretty certainly. I did not get into exceptions like private-copies or fair use here.