[tptacek]

I don't understand this argument at all.

I've posted a couple things to Craigslist. Maybe it's different for rental listings, but for what I've posted, Craigslist did not demand exclusivity. If I wanted to post my listing to some other service, I was free to do that.

Similarly, regardless of what Craigslist's policies are with regards to third party access: it's still your data, right? You are free to post it to an open classifieds service?

That being the case, from where do you derive this idea that Craiglist has somehow taken custody of your data, and thus owes the rest of the industry some measure of access to it? Why is that Craigslist's job? If you want there to be multiple competing listing services, push your data to multiple services.