Try enforcing it!
Airbnb will over rule you
Their site , their rules unfortunately
I know I had a situation, I made it clear on my listing that I charged for all children regardless of age
They overruled me and the guest was allowed to cancel with no penalties
I rest my case.
You are now working with a huge company with their own Lawyers who know how to wrangle out of any clause that you may have over looked.
Have you read their 100 odd page agreement in detail?
probably not I suspect.
There is not enough time in the day and you will need your own lawyer to be able to understand it.
Ashleigh