Earlier quoted context omitted.
Revenue is to be made on unique visitors and impressions. No clicks are required.
So the loss of traffic is a good thing because advertisers aren't paying for impressions that aren't actually seen? ;)
Sites want as many unique visitors as possible because larger sites get more attention from advertisers, it permits better frequency capping, and enables better segmentation of audiences. Even though they get paid per impression, larger uniques tend to allow for higher CPMs.
Separately, it's worth considering that many writers are measured on metrics: uniques, minutes, shares, comments, etc. In some places, they might even get paid on such performance (I think Gawker did this). When content gets copied, the writer can be deprived of such credit.