I completely agree and I find it mystifying that you would be downvoted for that comment.
If you want to read a book, just get off the computer and read a book.
Really? I guess I'll "just" stop all my bad habits and replace them with good habits as well, shall I? And I'll "just" stop playing wrong notes on the piano too. Because, y'know, there's no reason I'm playing wrong notes, is there? There's no reason I have bad habits continuing year on year, there's no reason he's spending too much time on the internet, no complex interplay of a lifetime of biological, neurological and psychological drives and feedbacks, right? Humans are simple. That's why there are no problems in the world and everyone "just" is the ideal person they want to be.
Nobody is saying that it's easy to avoid internet distraction while using the internet. But it is easy to block out a few hours of not using the internet even if you are paying for a connection. It's quite similar to not going to a coffee shop for the same few hours.
To use the internet at the cafe, I have to put on my shoes, my coat, walk 5 minutes, buy a coffee, sit down, open my computer, etc.
It's not hard to do any of that. But it's a lot more effort than pulling my phone out of my pocket.
It's one of the main reasons I find value in having an office, and it is a non-trivial (though, thankfully, subway-based) commute away.
I addressed that rather simply, I thought. It seems that his biggest problem with the Internet was that it was too easily accessible. Not having Internet is a very obdurate way of approaching this, in my opinion. Note that most of the things the writer did as an alternative were not on the computer. Instead of separating the Internet from their computer, I simply suggested separating themselves from the computer.