Well, what if we flip it around: What gives you the right to own a bunch of extra AirBnB properties in the first place? It's just a set of assumptions that we've been living under for a while and that we can change if the society overall wants to. Some feudal lord 500 years ago might have said "What gives you peasants the right to own any land at all, or question my judgment on any matter?" There's nothing magical about the particular conception of property rights we're currently immersed in.
Why, it is very magical indeed. Property rights are one of the top variables that differentiate rich countries from poor. But don't let that stay in the way of what you feel is right.