Uh, sorry. I like Airbnb, and I like to support startups, but trying to make the claim that you should't have to know the law in every market you operate in just doesn't fly. If you don't know the laws in a market, don't operate in that market until you do. Hire people who know the law. Bring on lawyers from different regions. Have even just one person whose job is to research the laws in the markets you're moving into.
I don't want to have to know the speed limits of every road I drive on, but if I don't pay attention to the signs (or the highway code for unmarked roads), you better believe the officer won't care what I do or do not want to know.