What I am finding is that guests are using the COVID 'free cancellation policy' to cancel reservations that they have simply changed their mind about or have gotten a better offer, therefore making the host cancellation policy void. This policy is put in place to protect us as hosts and it literally means nothing at this time. My feeling is that if guests have booked in a post pandemic world they know the risk v responsibility as a traveller and should not be able to use COVID as an excuse except in the event they have indeed contracted the virus or have come into contact with someone who has it. In that case a Doctors certificate would also be required.
If Air Bnb were to roll out a travel insurance policy all our problems would be solved!