I don't understand what they are actually doing to prevent the sale of stolen bikes through their site? I don't see anything on the bike listing or stolen bike search pages that would help with this.
Then, they wrote a blog article filled with hyperbole about business theory, angry NPR readers, Pee Wee Herman, and photos of flying sparks.
Many bikes photographed in the same spot. Poor-quality photographs (blurry, etc.) that make it difficult to pick out distinguishing marks. Very little detail about the bike's components.
None of these are proof of a stolen bike, but each is a useful flag, an indicator that the ad is worth further scrutiny, and flagging could help people looking for their bike.