Comment by Shish2k

TL;DR: "this is a decision applying only to a narrow, specific circumstance." - Craigslist sent a legally valid cease & desist letter to 3taps, explicitly revoking their default-allowed access. 3taps changed their IP and continued scraping -- it's the ignoring of the cease & desist that's the problem; that they did so by changing IP is just a technical detail.