I definitely saw people calling that they are going to work from home, but saw very little work to be done that day. Which probably means that people used that as excuse, as they had some business to do outside work, and they did not want to take PTO.
I have very little believe that a majority of people can work from home, especially when travel. You are at new place, you going to work like 4-6 hours instead of 8-9 hours. So I do understand why airbnb is telling their employees to do so, but curious how long it is going to last, and curious how real it is going to be (considering that it could be up to management approval as well). But I doubt that other companies will follow that.