Windows, on the other hand has, as the author says, For Windows many solutions claim to exist, usually in form of massive antivirus suites that provide the locked-down, restricted environment that parents often think will stop their children accessing material the parents don't want them to (ha!).
So if you want to feel as if your child is "protected" then that is the way forward. At least while they are in your house, using your systems. Obviously once they go to school, to friends' or get a device of their own then none of these controls is worth a dam' any more. But that's life!