I doubt they care. One host stopps hosting, they get a new one. Like Uber drivers: disposable.
There is no way to prove if any of negative reviews nor low star numbers are valid if the guest did not like you or whatever, even if you do their laundry, like I did, and talk to her making sure she was comfortable. She wrote her bed was a sofa (not true at all), and it was too soft... The fact: the mattress has a label Extra firm and we put a memory foam to make it softer that could be easily removed by her or me if she even mentioned any of it.
Airbnb wrote me a warning that if I get another low rating, they will block me.
Even if I argue the review, little chance it will be removed but my reply would be hard to prove since there is no way to include pictures. Also, there is no way to change the star rating if the guest was not right.