Mobile phone subscriptions in the UK go the other way: By default they filter some content. If you tell the phone company to turn it off, they do. It's less invasive than this law because you don't need to tell them why you want it turned off, but still more draconian than if we could turn on a child safe mode that e.g. then required a pin or something to disable.
I can't imagine that it would pass as-is since on its face it seems to apply to all computers and all software including things like nginx or nftables that the entire modern economy relies on, but who knows?
[0] https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml...
There is a conspiracy and it's being rolled out. There was already some country that declared anyone running non-standard OSes on their phones are highly suspect.
It doesn't need e.g. code signing or anything else of the sort.
To be clear, I think all of this is a massive overreach - my point is only that you can achieve the claimed aim with far less invasive means.
That, if anything, makes the chosen idiocy even more troubling to me, as either they're incompetent, don't care at all about the implications, or there are unstated aims.