Seems like Airbnb could monitor certificate transparency logs for these sketchy domains to inspect and initiate legal action against (at least for domains using not using an airbnb subdomain).
I reported one to them through their support chat, full url + screenshots, they said it was forwarded to “the concerned department” and then a few days later closed the ticket. It’s still up and I haven’t heard anything from them since. Maybe this article will make it a higher priority for them though if there is anything they can do.