My first thought about what it would be like to be a user in this situation is that, upon seeing the "site blocked" message, I would simply go hunting around for a similar site - maybe MSNBC instead of CNN for example. It's the content I'm looking for after all - news in this case - that matters. I might have to Google around a bit to find that content of course and try a few alternative sites.
So wouldn't this approach actually increase the bandwidth usage?
As noble as the cause is, this approach doesn't seem very effective to me.