The real upshot of (attempting) banning media or phones or tech from certain categories is that EVERYONE will have to give their information out in order to weed out the undesired group... and significant numbers of undesirables have ways of figuring their way around rules. (fake ids anyone?) so... the nannies collect all my personal information; they get hacked, my personal info gets misused and I end up with serious stolen identity issues the rule makers won't be helping me with.
I am all for child protection. I'm not for removal of freedom of everyone in order to attempt to police the unpolice-able.
If there are life-threatening issues (potentially unsafe drivers if there were no licensing of vehicles, for example) and someone like the DMV wants to manage who gets to drive... i can live with that.
If the lawmakers want to parent 'on behalf of' the parents who aren't watching their kids? (especially if they plan to farm out enforcement to thousands of private companies with a million different approaches to access management and/or data protection? That won't end well.
For one thing, it won't work.
I have watched people unlock their phones and hand them to toddlers. Anything to shut up the noisy 'brat' that you don't want to take time to give attention to. I wish the ability to breed came with parental impulses installed. Unless you are forced tech providers et it up to leave a camera on to monitor who is actually using the device, you can't control who actually has access if you're not in the room with them. Even facial rec can be hacked if you are determined enough. There is a limit of how many resources it's practical to use to monitor things.
There's always going to be a subsection of parents/guardians who won't parent, guardian or guide. And the laws will do ZERO to prevent their kids from accessing things they should not see or interact with because their parents will make sure they have access and later on, set things up to allow it. The same way such parents don't make it hard for their kids to get into the medicine or liquor cabinets.
Good parents will manage access to tech. they won't do it perfectly, but they will work at it, and they will educate their kids about the dangers they can face when they go on alone. The other kind of parent? Other than preventing them from breeding (which is a whole level of horribles beyond the laws we're mentioning) controlling them is impossible.
I don't want to give up my freedom to look at or interact with tech that is meant for grown ups because some poor parent doesn't give a fig.