> The only difference that matters between friendly exchanges (cooking and room/board) and AirBnB or underground restaurants is that one set of actions threaten the existing power brokers who have the ear of City Hall.

I think it's a shame that most people are too cynical to understand why laws and regulations around food, housing, transportation, etc. exist. Odd in particular that you think preventing underground restaurants has anything to do with protecting the power brokers when there's a big public health case to be made for ensuring that food is prepared in a sanitary environment. I'm guessing you're in favor of a solution that let's people get sick/die and then let the free market enact it's revenge on the restaurant. Good thing we decided to leave that model out with the 20th century.