If airbnb reminds people they may face legal risks in participating in the service, the hosts may be less likely to continue, which is not in airbnb's interest.
Oh, I understand the short-term capitalist incentive. It doesn't mean that it's right, legal, or in the company's long term interest. What if a class action lawsuit of hosts getting evicted hit them? I have trouble imagining on which grounds this would be successful, but then again IANA(class action)L.