I am not sure what the problem is. Is AI using an exact copy of an image or is it just learning what things are (such as young child learns looking at picture books).
I may be wrong, but a copyright protects YOUR image of a tree, but it does not protect images of trees.
There are most likely trillions of images stored around the world. If they are just teaching AI what a “tree” is, and by extension the various species of trees how is anyone going to prove that an AI’s drawing of a tree came from their collection?
Did Andy Warhol owned the copyright on Campbell’s soup (no).
Artist have for centuries copied features and techniques from other artist and that appears to be what AI is doing.
As long as they are not presenting the creation as the art of a particular artist (forgery) then (in my unlawyerly ) opinion they can’t do much to stop it.
They are using artist’s work to enable users of their software to create an image in the “style” of that artist.
A person spends years of effort to develop their own style. If that is taken without their permission, it’s not good. Just like any form of intellectual property, copyright, or patent.
But I suppose if you’re in the school of “If you’re not shoveling shit for a living, you don’t have a real job”, these notions may be lost on you.