An operating system is not a tool for accessing porn.
To state that this is required for protecting children from porn or harmful content means there is an essential misunderstanding of what an operating system is.
When you say privacy, I say surveillance.
I will not be proving my identity in anyway to my computer. It's never happening whether you like it or not. I will fork an old Linux distro before I submit to that.
Your argument -- that this type of privacy intrusion is inevitable -- is also a full of various logical fallacies which i am not going to take the time to list.