Rent-seeking by controlling AI models is anti-commons, the models themselves are not, neither is training them. Don't delude yourself into thinking that Miyazaki didn't study Moebius didn't study Mucha. Even if you got your way and all training on copyrighted material was stopped today and all existing models were deleted it would only be a matter of time before we could synthesize arbitrary styles (at least as well as we can today) by identifying and controlling the correct axes in tensor space using a model purely informed by public domain data.
Your art is mostly not yours, your art is mostly an amalgamation of other people's art which itself is also the same, all the way down. You are a sprinkling of flavor on top. Your art is stolen styles, techniques and vibes mashed together. And here you are, trapped arguing about where we draw the line on what's okay. 75 years? now 95? Look at what you're saying! Introspect and realize that your understanding of the context is defined by Disney and Bono wanting to collect rent on ideas. You're just focused on getting your crumbs of the pie in a game that's rigged to centralize power and keep it centralized.