It's also hard to actually confirm usage rights for literally any AI-generated assets, since it's been demonstrated time and time again that many AI generators actually just straight up will spit out somebody's copyrighted work almost identically if given the right input, and it's hard to confirm whether or not even stuff like Adobe Enhance was or was not trained on stuff without permission. I'd imagine that's another factor in why it's not being allowed, since if you can't actually be sure what you're using is legally in the clear, well... following rule 8 becomes almost impossible due to the "have the usage rights to use them" part.
it's been demonstrated time and time again that many AI generators actually just straight up will spit out somebody's copyrighted work almost identically if given the right inputCould I have a source for this? All the instances I've seen of such a claim actually turn out to be the result of a thief feeding the model someone's work as an input, a deliberate action that is distinct from allowing the model to generate an image from scratch; it's akin to a thief taking someone else's art and putting it through a Photoshop filter in order to pass it off as their own.