Cultivation is widely dispersed in CA as well, and again, so far as I am aware, it has not been an issue.
I looked at the
current state of CA law as passed and signed in Sept.
Large scale cultivators in CA (10k sq ft+) are limited in number as set by the CA Dept of Food and Ag. That looks like the IL law and the proposal in OH. It looks like those large scale cultivators in CA also are barred from other aspects of the process such as manufacturing and distribution.
The difference I see in CA compared to IL and the OH proposal is that CA has a class of license for small growers. But even in CA the small growers are very limited as to the number dispensaries they can serve. It looks highly structured and regulated in CA to me.