Yes, that tax collection 'in part' is indeed the weird part in this particular case. However, I am sure the whole subject is one 'living, breathing' costly exercise for Airbnb. Taxes do continually change, so imagine the logistics to keep up with that.
There are also other ramifications, some host pay taxes, some do not, some include it in their price and some do not, and so on.
Personally, I am a card-carrying member of the 'Careful what you wish for' fan club, specially when getting others to do what I could just as easily have done and maintain control.