I don't think it is right morally or legally to force guests who cannot in any way benefit from a service to pay for it or part of it @Sarah3087 . Clearly in the vast majority of cases guests cannot travel and therefore can't use the accommodation.
I think hosts who haven't set aside income from their business for when things are slow, should look at alternatives to generate income such as long term lets, setting up their own FB page or website and offering local accommodation for those who might need to self-isolate etc.
Absolutely our situation is unique