The same reason facebook bought instagram: craigslist doesn't want any other web site's userbase to become the kernel for a replacement listing service.
Once you have a web site that attracts buyers, you can replace craigslist data with your own listing service and stop paying for their API.
They clearly don't fear this kind of competition in the mobile space, hence offering licenses for mobile-only API use.
Once you have a web site that attracts buyers, you can replace craigslist data with your own listing service and stop paying for their API.
They clearly don't fear this kind of competition in the mobile space, hence offering licenses for mobile-only API use.