Most delightful phrase I've read in weeks, thanks for the chuckle. :)
If you've ever used thumbtack, a marketplace for services, they have an auto post to craigslist as well that is pretty interesting.
Yes it's auto submission, but with craigslist's new security measures and login requirements, that looks really hard to do purely from a URL standpoint. I'm almost wondering if there is some private API they are using or if they have some sort of partnership going on.
The page linked above states that "sublets & temporary" is one of the "categories for which bulk posting is no longer supported." Vacation rentals is not one of these though.
However, craiglist could make life hard for irbnb by changing their form field names. Then again airbnb could probably detect the changes. Probably the best way for craigslist to deter airbnb would be to have a single field at the start of the listing process. :)
For example, https://post.craigslist.org/nyc/H/sub/brk is the first step in creating a posting for temp place in Brooklyn. I assume they have a way of defaulting the other form values.
I guess this also explains why they set no-cache and no-store pragmas on their posting pages, which caused me to lose a lengthy post when I accidentally dragged something into the browser window. Jerks.