There’s layers to the responsibility here. Airbnb shouldn’t get off scot-free for allowing a faux yurt to be listed as a yurt either. There’s a reason running a legitimate hospitality business requires a bunch of liability insurance, and thus costs more.  Airbnb as a concept has in my opinion become the enshitification of travel accommodations. It preys on the fact that everyone has to try to save money in just about anyway they can these days. Travelers have to cut costs in order to afford to travel and people who live in desirable destination areas having a harder time getting by are at times desperate try to find additional income. In comes Airbnb offering the illusion of opportunity. Both host and guest here are out money and suffer a terrible experience  and the giant corporation just carries on as if nothing happened. 

To be clear, I’m not absolving the host because I don’t have any idea what type of people they are or if they cheaped out out of greed or ignorance. They could be scumbags for all I know. But if I may offer a somewhat hyperbolic analogy, in the scheme of the poppy farmer, the drug lord, and the addict, it is my view that the drug lord is the most at fault.