Hold a Sit-In!
What we need to do is attack the demand for spam. We can hold a "sit-in" at the sponsors' web sites! Just as with a traditional sit-in, we choose a place (ie the spam sponsor's web site), set a time when everybody should go there, and then at the appointed time, we all "go", ie repeatedly request the page.
Just as a million interested citizens inadvertently brought down the U.S. Affordable Care Act web site, we can bring a spammer client web site to a standstill, if enough of us want to, without doing the site itself any damage, nor breaking any law. Each participant in the sit-in is doing just what the spammer client wants us to do: go to the site.
Sit-In app (currently available only at the SlideME android market) from earth42, facilitates each part of this process.