Learn yes, if its legally shared. Copy and earn from it without acknowledging original author and sharing earnings, in most cases, definitely not. As we know, things that often move so fast have law catching up easily after a decade if not more (I am still waiting for a proper slap to FB), and entrepreneurs are well aware of that.
But that's not how it works at all? If I watch 100s of artists cell shade something and build a normal piece of software that mimics the results I owe them absolutely nothing. I've not seen an explanation as to why this is different.
People are fine with AI learning stuff from others. People are not fine with AI trained on everyone's recorded work and then replacing everyone to make massive profits for just that company.
Private owned GAI is a dystopia, shared GAI is utopia like star trek. The difference might seem tiny today, but people really don't want to go down the dystopia route.