I doubt it. I worked at a company that aggregated job listings from Craigslist. We actually didn't do anything insidious; in fact, we served up their jobs with attribution and if the job was clicked, it would take the user to the Craigslist site. So basically we were feeding them extra traffic.

They sent a cease and desist relatively early on (not waiting until we got bigger).

It's likely that they didn't know and have either just sent them a cease and desist or AirBnb has chosen to ignore it.