It's not fair to surprise people
I booked a non-smoking king bed but upon arrival was told that all their king beds are in smoking rooms. That not being an option for me I was downgraded, without any concessions. This was a non-refundable reservation which I should have taken as a warning. When they have specific new conditions for guests upon arrival I see it as not something I agreed to. What is obvious upon arrival is that they are dealing with a serious local issue. Those conditions, and their efforts should probably be disclosed ahead of time.