Making all ai work public domain is a great idea… until you start trying to draft actual laws. If ai is only used to make the eyeballs of character is it public domain? If I use a stable diffusion base but then fine-tune it on my own work is it public domain? What if I use ai to make the general idea, then I use that as inspiration to make my own work? How does anyone prove that anything is or isn’t ai generated or assisted? The list goes on and on. Making laws about ai use in art simply isn’t realistic, they are just too hard to nail down, and too easy to skirt. I don’t know what the solution is, but it isn’t this unfortunately.
The other big problem with it is that it just means that few big companies who already own almost all the IP(yes, most professional artists don’t actually own their own work) just make their own models with their own work and are able to enjoy the benefits of AI while any small group just has yet another disadvantage. It will probably be these big companies pushing for anti-AI/“pro artist” laws.