Airbnb's initial allowing for cancellations for any reasons was started on March 14th and lasts one month, currently ending on April 14th. Based on their existing communications to owners, I believe they will most likely move to a location dependent version of this policy as we move closer to that date.
Also, as an owner with two short-term rentals, it has been very challenging for us as well. We are getting cancellation requests for bookings into May and June that are outside of our 90 day cancellation window. Vrbo is pressuring us to allow those guests to cancel, but this isn't easy for people depending on that income. We have been trying to allow cancellations if travel isn't allowed (our units are in Hawaii so incoming travel isn't really allowed right now), but many of the travel bans currently in place are for 30 days.