Here is a good one for you all, along similar lines. We normally encourage our guests to book for only two (2) and then add whomever they wish along the way or even up to the day before their arrival, up to 6 people total, the limit. This prevents a lot of changes along the way with bookings 1-3 years ahead of time.
This last summer just before the 2 guests were scheduled to arrive in 3 days, they tell us that 6 in total (4+) are now coming but hadn't changed their reservation yet, but right after that we get a notice of cancellation from Airbnb (with a full instant refund!) that our 2 guests are not coming because 'someone in their group' tested Covid-19 positive.
What was not so odd is that that same guest had asked just a few weeks prior, we are on Super Strict 60 cancellation policy mind you, whether they could cancel and get a full refund because 'they now needed the money'. We offered to postpone their stay, as always.
Slick move. It is events like this that reminds one every so often that the Airbnb CS department can't be trusted.