> I’m trying to avoid screens at least one day out of the week, and this is my way of encouraging others to consider doing the same.

Sorry but I find this incredibly paternalistic.

What if I am avoiding screens one day out of the week—on Saturday? Heck, maybe I avoid screens Monday—Saturday and Sunday is my only screen day?

It's great that you're avoiding screens on Sunday! Really! Blocking pages for everyone else just makes the world a very slightly worse place for no benefit.