@Alastair0 I agree there should have been at least an email, or some other notification by now. I've only been active on the community forum for a month or two, since I had a complainer guest, and wanted to get some opinions from other hosts, and also hit a really quiet period in December, and January, and have a bit of time on my hands.
While I understand the rationale of avoiding panic, in a situation like this, the updated cancellation policy should have been adequately published.
You'd have to google "Airbnb coronavirus" to find it. Apparently, a Chinese language notice was circulated to affected areas (Wuhan), while leaving the decision to stay open for business with hosts. I don't disagree with this last part- I think it is up to each and every host to make their own decision about what to do, given the facts. But the facts do need to be published.
https://www.businessinsider.com/wuhan-coronavirus-apple-amazon-google-close-offices-travel-china-spr...
https://www.scmp.com/tech/apps-social/article/3048382/airbnb-hosts-coronavirus-epicentre-wuhan-stay-...