@Natasha388 We have written in our listings that we will refund 'any monies we have received if it becomes illegal for us to host or a guest to travel to us' - take a look at our listings and you will see the precise words but this means we are not responsible for the Airbnb fees.
If and when someone cancels then we will suggest they take Airbnb to the small claims court for their service fees as, even though people know there is a pandemic (their argument), I don't think it is fair that people have to guess the trajectory of infections and lockdowns.
It annoys me that Airbnb are taking this stance and I believe the Competition and Markets Authority will have a go at them soon. All their stance does is stop people booking as they fear for their service fees.
Hope this helps