I like this idea. Unfortunately the small cost to each individual site operator is too great for their own motivation - despite the value it might add. I guess

I like this idea. Unfortunately the small cost to each individual site operator is too great for their own motivation - despite the value it might add. I guess that value would be more intelligent filtering which may actually be a good thing. A lot of innocent content gets blocked. It won't cause everything to get blocked - if they were going to block everything, they could have done that already.