@Peter2704
I've not experienced this as I host private rooms in my own house and mostly solo/long-term guests so I wouldn't get requests from multi-households but, no, I don't imagine for a second that Airbnb are policing requests at all. They just use a blanket policy, which amounts to either stopping all bookings (ignoring the Government's extensive list of people who were exempt from the restrictions) or allow all bookings regardless of Government restrictions.
It's hardly surprising as I am sure they do not have the resources right now to go into this kind of detail/request evidence etc. I mean, you only know the guests are from seven different households because they told you, right? They could have lied about it and, if Airbnb doesn't require any evidence of adherence to regulations, how would you know?
So, yes, unfortunately, it is left to us to deal with these kinds of requests. I also hate to hit the decline button, so usually I explain politely to the guest why I'm not able to accept their booking and ask them to withdraw it. Sometimes that works, sometimes not.