Even in localities where it is legal, the ratio of "hosts" running their operation in accordance with the law is comically low. There is a serious enforcement problem and it's largely because AirBnB does everything it can to not cooperate with local government.

It’s illegal across most localities, if not banned by the lease when not outright illegal.

Tokyo has a similar registration requirement as SF now, and even in Taiwan I almost always have to identify myself as a relative of the host.