It doesn't matter that you could do those things before the internet the normal and often only or only practical flow involves the net.
Counter offer we keep letting people manage their own kids' shit and they can control access to the degree they deem appropriate
But the problem is that people are NOT managing their own kids' shit, and now we have to have things put in place to try and counter that - and end up overreaching.
I'm more than happy to educate mine on how to be safe online, and to come and talk to us about stuff, other aren't, or are not aware they need to.
Perhaps buying internet means you have to sign a waiver saying that if anything happens because of the internet then that is on the parent(s)...
All four of my daughters prohibit my 7 grandchildren from going anywhere near roblox. My grandchildren are currently ages 2-11 but my daughters are so outraged by what happens there that they say their children will never be allowed on roblox until they move out of the house. Apparently it is extremely predatory, lots of bullying, and highly sexualized - and while children are the site's target audience, the site provides no effective oversight.