Aside from the fact that it is a stupid law, there should not be any sort of exemption.

I have not read the other proposed laws in this category but after reading the California law, I found it was so vague that my interpretation is that any operating system where the owner, well... actually owns the system is already in compliance. The law requires a mechanism where the OS can provide owner age data to applications. All operating systems where the owner is in control already provide a mechanism to supply data to apps, on most (mac, windows, unix, dos even) systems this is the file api, So to be in compliance with the law the owner can make a file that an application could access with the required info. No, there was nothing there about when an application needs this data, or even, like so many people assume, that it has to be out of the control of the owner.

The CA law was so vague and pointless, my only conclusion is that it is a sort of frog boiling scheme. Test the waters to see if they actually have jurisdiction.