Anyone that does this is just trying to indoctrinate their kid and prevent them from being exposed to any other ideas.
Books, magazines and libraries still exist, though.
Nevertheless, I won’t probably be as radical as to completely ban Internet from my two younger kids. But the idea is interesting after seeing via my older kids what an unrestricted access led to.
I’m curious of this as a thought experiment: what do you think the children will miss if they don’t access the Internet before the age of 16? What did the hundreds of generations of children before the invention and spread of Internet lack?