This is nice and all but I don't think anyone is going to go to websites and type /freedom.txt to see if it has it. It's much like the humans.txt file. No one actually reads these things.
Maybe we should all resolve to do exactly that every now and then. Competent website owners will soon notice a spike in 404s looking for it...
For the humans.txt, there is an add-on for Chrome that let's you see very easily when a website has one. I do read them when I see one especially if it's a site that I go to often.