This is just offensive. It would be one thing if Craigslist was doing their best to satisfy their customers and they wanted to shut down others who were scraping their site and leeching off their business. However, Craigslist puts absolutely no effort into making their product usable. The continued existence of Craigslist is just a testimony to the enormous strength of network effect lock in.
Disagree. Craig Newmark has said that he's scared to make drastic changes to the UX specifically because he doesn't know what magic recipe keeps people coming back. Do I like the CL layout? Nope. Does that mean other people should steal the content and profit from it? Probably not.
In craigslist's case, he could include a link on the old site that allows users to upgrade to a more modern version, and have the modern site basically consume an api/scrape the old CL till it gained momentum.