They seem inconsistent in enforcing it. One piece of software that accessed it got a complaint from Google: http://igargoyle.com/streetview/
I was working on a similar project a while back, to view Street View through various filters (B&W high-contrast, pseudo-cyanotype, etc.), but I did it by pulling a few hundred images and caching them, to avoid hitting it in real-time, which I thought might be a problem. Given that I see several of these not being taken down, though, maybe I was too cautious.
Fwiw, Cyano-View Copenhagen was my project (hit "[reload]" at the top/right for a new random view, or scroll down for concept blurb):
I was working on a similar project a while back, to view Street View through various filters (B&W high-contrast, pseudo-cyanotype, etc.), but I did it by pulling a few hundred images and caching them, to avoid hitting it in real-time, which I thought might be a problem. Given that I see several of these not being taken down, though, maybe I was too cautious.
Fwiw, Cyano-View Copenhagen was my project (hit "[reload]" at the top/right for a new random view, or scroll down for concept blurb):
http://www.kmjn.org/projects/cyanocph/