@John2654
You have the choice of your cancellation policy.
If you chose "flexible", that boosted your listing, got you the top of the search results, and gave you a competitive advantage over others who chose "strict".
Your guests perhaps sought out with a filter your property, knowing they could cancel up until arrival week.
There is no bait-and-switch here! You chose flexible, a global crisis happened, people reacted according t what they agreed with you from the start. Difficult then after the fact to want to change the terms to "strict" so you can get some compensation.
Hosts with "strict" knew that they had staff, mortgages, investments, renovations to cover. They knew their property was booked 6-12 months in advance. They wanted to protect themselves against cancellations, despite knowing they would not be boosted in the search results for this. They thought that in hard times they would be assured of at least a minimal income as defined in the booking terms! Most of them could have also rented on other platforms with more fair cancellation policies to the host.
I understand your frustration, I wish everyone the best and keep safe .