No, the point was that the actual decision happens client side and under the control of the sysadmin (the parent).
> You are just moving the verification point to another gate
Yeah, the gate being the decision of legal entities of age, aka. adults.
> You want to use your friends, Wi-Fi?
That would still do whatever your parent decided for you.
> Want to connect your can toilet to the internet?
Whether the toilet can connect to the network, is the decision of the network administrator, and toilets don't contain UAs, so that wouldn't even have software on them, where you could configure such behaviour.
You're making the mistake of assuming that every kid has access to identified device and that device is under parent control. You can't make this assumption because that's not true.
It might be true for some middle class helicopter parents that have iPhones and time to manage and keep it under strict control but there are non-middle class kids out there who just use whatever device they can get their hands on and their parens neither have time nor ability to control that.
There are definitely toilets that have UAs.