I've used Internet Lock effectively in the past. Presumably there's some way around it but it sounds like you're like me and don't know enough to find out what that way is.

Currently I do use internet, but with severe filtering restrictions using both K9 and Microsoft Family Safety. So for example, I couldn't follow the link you provided to explain your goals, because K9 blocked it. My wife has the password to both programs, which she makes sure I don't find out. She also carefully monitors what I do online (at my request - plus I told her what types of things to call me out on) using SpectorPro. So yes, that means she'll see what I'm writing now - hi dear! Obviously this wouldn't work without a good partner.

I don't have a smartphone, and neither does my wife. I'm a student, so perhaps that doesn't count, but my wife's a database / software consultant, and she gets along just fine without one. Again, that's not getting rid of the internet, just the smartphone.

I know several people who don't have internet access in their homes, and several who don't even have computers. They work in positions where they don't need to take computer-related work home with them, so any computer / internet use they have is at work. By the way, that's the most effective way to do it - just ditch the computer entirely if at all possible. If it wasn't for the fact that I need it for studying I'd do it myself.