This article seems to want this to look like a unified movement, but it seems more like a bunch of small groups in different areas who aren't working together, and may not even agree with each other if you get them in a room together. The issue-specific people ("no car ads!", "no gambling ads!") may not go to bat for someone else's issue, and may look at the "no ads whatsoever" people as extremists who distract from their specific cause.

I guess my point is this seems like a bunch of weakly-related data points, rather than a strong signal of a movement. Too bad, since I'd love to see drastically fewer ads in public spaces.