Exactly this. If you want ai to exclusively be controlled by massive companies like Meta and Google, this is how you do it. They’ll be the only ones that can afford to pay for public copywritten content.
Copyright is the legal method to limit redistribution of easily copied material, not as if there's anything else people could appeal to.
I ain't a fan of copyright but make it last 10 years instead of X + infinity and maybe it's not so bad. I can't argue against copyright fully as I think copyleft is essential for software.