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Pornhub goes dark in Arkansas after age verification law kicks in
(www.theverge.com)
This is a most excellent place for technology news and articles.
So none. All devices have the capability to control access.
But that whole conversation is in context of governmental control vs. parental control. In my opinion governmental control infringes much more on everyones rights in this case. So obviously your statement is interpreted in this context, not in vacuum.
Parents do not have access to parental control on devices of other children, other adults, school, libraries, etc.