I don't have time to pursue this. But I suspect that you could argue that a state doing this is violating the commerce clause. I feel like states can create som

I don't have time to pursue this. But I suspect that you could argue that a state doing this is violating the commerce clause. I feel like states can create some types of monopolies but not others. You can create a power monopoly, like I have to connect to PG&E's grid and pay them. But California can't pass a law giving Hasbro the sole right to sell toys in California.