Nobody can prevent you from drawing a photo realistic picture of Indy, or taking a photo of him from the internet and hanging it on your fridge. Or asking a friend to do it for you. And let's be honest -- because nobody is looking -- said friend could even charge you a modest sum to draw a realistic picture of Indy for you to hang on your fridge; yes, it's "illegal" but nobody is looking for this kind of small potatos infringement.
I think the problem is when people start making a business out of this. A game developer could think "hey, I can make a game with artwork that looks just like Ghibli!", where before he wouldn't have anyone with the skills or patience to do this (see: the 4-second scene that took a year to make), now he can just ask the Gen AI to make it for them.
Is it "copyright infringement"? I dunno. Hard to tell, to be honest. But from an ethical point of view, it seems odd. And before you actually required someone to take the time and effort to copy the source material, now it's an automated and scalable process that does this, and can do this and much more, faster and without getting tired. "Theft at scale", maybe not so small potatos anymore.
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edit: nice, downvotes. And in the other thread people were arguing HN is such a nice place for dissenting opinions.